Pub Date : 2018-11-26DOI: 10.1109/PVSC.2018.8547716
D. Quispe, Syeda Mohsin, A. Leilaeioun, Z. Holman
Silicon heterojunction solar cells have a front transparent conductive oxide (TCO) layer serving an optical and electrical role to mitigate free carrier absorption and sheet resistance. A common optimization problem is the trade-off between fill factor and short-circuit current density when adjusting the carrier concentration of the TCO material. One way to circumvent this problem is to find high-mobility TCO materials and we contribute by performing a characterization of indium zinc oxide. We found that an optimum sample has a high-mobility of about 50 cm2/Vs with a sheet resistance of about 30- $40 Omega /mathrm {sq}$. For the same sample, absorbance in the infrared wavelength range can be 1–3%.
{"title":"Characterizing high-mobility indium zinc oxide for the front transparent conductive oxide layer in silicon heterojunction solar cells","authors":"D. Quispe, Syeda Mohsin, A. Leilaeioun, Z. Holman","doi":"10.1109/PVSC.2018.8547716","DOIUrl":"https://doi.org/10.1109/PVSC.2018.8547716","url":null,"abstract":"Silicon heterojunction solar cells have a front transparent conductive oxide (TCO) layer serving an optical and electrical role to mitigate free carrier absorption and sheet resistance. A common optimization problem is the trade-off between fill factor and short-circuit current density when adjusting the carrier concentration of the TCO material. One way to circumvent this problem is to find high-mobility TCO materials and we contribute by performing a characterization of indium zinc oxide. We found that an optimum sample has a high-mobility of about 50 cm2/Vs with a sheet resistance of about 30- $40 Omega /mathrm {sq}$. For the same sample, absorbance in the infrared wavelength range can be 1–3%.","PeriodicalId":6558,"journal":{"name":"2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)","volume":"51 1","pages":"3136-3138"},"PeriodicalIF":0.0,"publicationDate":"2018-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76042505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-26DOI: 10.1109/PVSC.2018.8548174
A. Augusto, P. Balaji, J. Karas, S. Bowden
Recently, silicon solar cells surpassed 26% efficiency. This was a result of remarkable low surface saturation current density and high short-circuit current provided by the SHJ-IBC architecture. In this paper we study the contribution of the different recombination mechanisms to shape the voltage at open-circuit and maximum power for different solar cell thicknesses. We demonstrate thinner cells are required to increase further the efficiency toward the intrinsic limit, as voltage increases and bulk lifetime dependence decreases. Open-circuit voltages over 760 mV were experimental confirmed on 50 μm-thick SHJ structures, leading to bandgap-voltage offsets of 0.349V.
{"title":"Impact of substrate thickness on the surface passivation in high performance n-type solar cells","authors":"A. Augusto, P. Balaji, J. Karas, S. Bowden","doi":"10.1109/PVSC.2018.8548174","DOIUrl":"https://doi.org/10.1109/PVSC.2018.8548174","url":null,"abstract":"Recently, silicon solar cells surpassed 26% efficiency. This was a result of remarkable low surface saturation current density and high short-circuit current provided by the SHJ-IBC architecture. In this paper we study the contribution of the different recombination mechanisms to shape the voltage at open-circuit and maximum power for different solar cell thicknesses. We demonstrate thinner cells are required to increase further the efficiency toward the intrinsic limit, as voltage increases and bulk lifetime dependence decreases. Open-circuit voltages over 760 mV were experimental confirmed on 50 μm-thick SHJ structures, leading to bandgap-voltage offsets of 0.349V.","PeriodicalId":6558,"journal":{"name":"2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)","volume":"1 1","pages":"2792-2794"},"PeriodicalIF":0.0,"publicationDate":"2018-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78995935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-10DOI: 10.1109/PVSC.2018.8547765
Manish Kumar, Arun Kumar
Solar photovoltaic systems are widely used to generate electricity from solar energy but the reliability and efficiency of PV systems are always of serious concern due to intermittent nature of solar radiation. The performance of the photovoltaic system depends upon various factors like type of solar PV technology used, irradiance, module temperature, wind speed, ambient temperature and other outdoor environmental conditions. The main objective of the study is to identify a suitable solar cell model for power prediction of a PV system for a location of interest and validate the results experimentally. A single diode model with 4 and 5-parameters is used for modeling of PV arrays. A hybrid approach of analytical and numerical methods has been utilized to identify the accurate parameters of solar cell model. The instantaneous output power is predicted by considering the effects of irradiance and module temperature on the power generation. The predicted power by both the 4 and 5-parameters models are compared and validated using an experimental PV system. The average percentage difference error between measured and predicted output power values for the 5-parameter model is 4.95% and 4-parameter model is 5.16%. The output power predicted using 5-parameter model is found to be much closer to measured values.
{"title":"Power Estimation of Photovoltaic System using 4 and 5-parameter Solar Cell Models under Real Outdoor Conditions","authors":"Manish Kumar, Arun Kumar","doi":"10.1109/PVSC.2018.8547765","DOIUrl":"https://doi.org/10.1109/PVSC.2018.8547765","url":null,"abstract":"Solar photovoltaic systems are widely used to generate electricity from solar energy but the reliability and efficiency of PV systems are always of serious concern due to intermittent nature of solar radiation. The performance of the photovoltaic system depends upon various factors like type of solar PV technology used, irradiance, module temperature, wind speed, ambient temperature and other outdoor environmental conditions. The main objective of the study is to identify a suitable solar cell model for power prediction of a PV system for a location of interest and validate the results experimentally. A single diode model with 4 and 5-parameters is used for modeling of PV arrays. A hybrid approach of analytical and numerical methods has been utilized to identify the accurate parameters of solar cell model. The instantaneous output power is predicted by considering the effects of irradiance and module temperature on the power generation. The predicted power by both the 4 and 5-parameters models are compared and validated using an experimental PV system. The average percentage difference error between measured and predicted output power values for the 5-parameter model is 4.95% and 4-parameter model is 5.16%. The output power predicted using 5-parameter model is found to be much closer to measured values.","PeriodicalId":6558,"journal":{"name":"2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)","volume":"1 1","pages":"0721-0726"},"PeriodicalIF":0.0,"publicationDate":"2018-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90172148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-10DOI: 10.1109/PVSC.2018.8547702
A. Lagaaij
Any serious climate change model shows the extreme risks to life, food and habitat were we to continue on current ways of making electricity, heat and transportation by combusting fossil fuels. The question for humanity is if the energy from the sun can become a benign alternative in time. Solar energy is now 2.5% of electricity worldwide. How quickly can it grow to 70% for electricity and heating? We are entering a new regime where the trinity electric vehicles, solar energy and storage will spiral upwards. Can solar bend the Keeling curve down in time for CO2 to not become disastrous? How can all solar energy actors act in greater symphony to be in time?
{"title":"Accelerating Solar For Decelerating Climate Change In Time","authors":"A. Lagaaij","doi":"10.1109/PVSC.2018.8547702","DOIUrl":"https://doi.org/10.1109/PVSC.2018.8547702","url":null,"abstract":"Any serious climate change model shows the extreme risks to life, food and habitat were we to continue on current ways of making electricity, heat and transportation by combusting fossil fuels. The question for humanity is if the energy from the sun can become a benign alternative in time. Solar energy is now 2.5% of electricity worldwide. How quickly can it grow to 70% for electricity and heating? We are entering a new regime where the trinity electric vehicles, solar energy and storage will spiral upwards. Can solar bend the Keeling curve down in time for CO2 to not become disastrous? How can all solar energy actors act in greater symphony to be in time?","PeriodicalId":6558,"journal":{"name":"2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)","volume":"30 1","pages":"2392-2394"},"PeriodicalIF":0.0,"publicationDate":"2018-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83151103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-10DOI: 10.1109/PVSC.2018.8547686
L. Nienhaus, Nadav Geva, Juan‐Pablo Correa‐Baena, Mengfei Wu, S. Wieghold, V. Bulović, T. Voorhis, M. Baldo, T. Buonassisi, M. Bawendi
By harvesting sub-bandgap photons, we have a path to overcome the Shockley-Queisser limit in photovoltaics (PVs). We investigate semiconductor nanocrystal (NC) sensitized upconversion via triplet-triplet annihilation (TTA) in organic semiconductors (OSCs). Since this process relies on optically inactive triplet states in the OSCs, we utilize PbS NCs to directly sensitize the triplet state via energy transfer. This is possible due to the strong spin-orbit coupling in PbS NCs, resulting in rapid spin-dephasing of the exciton. Current technology allows for upconversion of light with a photon energy above $sim 1.1$ eV. However, while internal efficiencies are rapidly improving, the low external device efficiencies render them impractical for applications, as devices are based on a single monolayer of NCs. Our results show simply increasing the PbS NC film thickness does not show improvement in the efficiency due to poor exciton transport between PbS NCs. Here, we present a new strategy to increase the external upconversion efficiency by utilizing thin tinbased halide perovskites as the absorbing layer. Resonant energy transfer from the perovskite to the PbS NCs allows for subsequent sensitization of the triplet state in rubrene.
{"title":"Solid-state infrared-to-visible upconversion for sub-bandgap sensitization of photovoltaics","authors":"L. Nienhaus, Nadav Geva, Juan‐Pablo Correa‐Baena, Mengfei Wu, S. Wieghold, V. Bulović, T. Voorhis, M. Baldo, T. Buonassisi, M. Bawendi","doi":"10.1109/PVSC.2018.8547686","DOIUrl":"https://doi.org/10.1109/PVSC.2018.8547686","url":null,"abstract":"By harvesting sub-bandgap photons, we have a path to overcome the Shockley-Queisser limit in photovoltaics (PVs). We investigate semiconductor nanocrystal (NC) sensitized upconversion via triplet-triplet annihilation (TTA) in organic semiconductors (OSCs). Since this process relies on optically inactive triplet states in the OSCs, we utilize PbS NCs to directly sensitize the triplet state via energy transfer. This is possible due to the strong spin-orbit coupling in PbS NCs, resulting in rapid spin-dephasing of the exciton. Current technology allows for upconversion of light with a photon energy above $sim 1.1$ eV. However, while internal efficiencies are rapidly improving, the low external device efficiencies render them impractical for applications, as devices are based on a single monolayer of NCs. Our results show simply increasing the PbS NC film thickness does not show improvement in the efficiency due to poor exciton transport between PbS NCs. Here, we present a new strategy to increase the external upconversion efficiency by utilizing thin tinbased halide perovskites as the absorbing layer. Resonant energy transfer from the perovskite to the PbS NCs allows for subsequent sensitization of the triplet state in rubrene.","PeriodicalId":6558,"journal":{"name":"2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)","volume":"38 1","pages":"3698-3702"},"PeriodicalIF":0.0,"publicationDate":"2018-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88463619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-10DOI: 10.1109/PVSC.2018.8547595
Elizabeth Palmiotti, Sina Soltanmohammad, A. Rockett, G. Rajan, S. Karki, Benjamin Belfore, S. Marsillac
Conditions promoting the recrystallization of CuIn(1-x) Se2 (CIGS) deposited by co-evaporation at 350°C were studied. Cu-rich and Cu-poor CIGS samples were annealed at 400°C and 550°C for 1 hour in the presence of alkali halide, In3Cl,Cu2Cl, SeCl4, and Se vapors. Increases in grain size of greater than 10x were observed with In3Cl with Se, Cu2Cl with and without Se, and SeCl4 at 550°C. Smaller magnitude grain size increases resulted at 400°C. Film composition was influenced by the vapors present with In3Cl enhancing the In content and Cu2{Cl enhancing the Cu content. Based on XRD analysis, the In3Cl+Se treatment best preserves the CIGS structure while resulting in a large amount of grain growth.
{"title":"Post-Deposition Recrystallization of Chloride Treated Cu(In x Ga (1-x)) Se 2 Thin-Film Solar Cells","authors":"Elizabeth Palmiotti, Sina Soltanmohammad, A. Rockett, G. Rajan, S. Karki, Benjamin Belfore, S. Marsillac","doi":"10.1109/PVSC.2018.8547595","DOIUrl":"https://doi.org/10.1109/PVSC.2018.8547595","url":null,"abstract":"Conditions promoting the recrystallization of CuIn<inf>(1-x)</inf> Se<inf>2</inf> (CIGS) deposited by co-evaporation at 350°C were studied. Cu-rich and Cu-poor CIGS samples were annealed at 400°C and 550°C for 1 hour in the presence of alkali halide, In<inf>3</inf>Cl,Cu<inf>2</inf>Cl, SeCl<inf>4</inf>, and Se vapors. Increases in grain size of greater than 10x were observed with In<inf>3</inf>Cl with Se, Cu<inf>2</inf>Cl with and without Se, and SeCl<inf>4</inf> at 550°C. Smaller magnitude grain size increases resulted at 400°C. Film composition was influenced by the vapors present with In<inf>3</inf>Cl enhancing the In content and Cu<inf>2</inf>{Cl enhancing the Cu content. Based on XRD analysis, the In<inf>3</inf>Cl+Se treatment best preserves the CIGS structure while resulting in a large amount of grain growth.","PeriodicalId":6558,"journal":{"name":"2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)","volume":"117 1","pages":"0163-0166"},"PeriodicalIF":0.0,"publicationDate":"2018-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90537061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-01DOI: 10.1109/PVSC.2018.8548246
P. Manganiello, Pavlos Bosmalis, M. Baka, E. Voroshazi, D. Soudris, F. Catthoor, J. Szlufcik, J. Poortmans
Reconfigurable photovoltaic modules represent an effective solution to improve PV system resilience to partial shading. Indeed, the availability of different configurations increases energy generation under non-uniform conditions. However, the additional components that are active under uniform conditions lead to higher losses compared to equivalent static solutions. This paper presents a methodology for the design of optimized reconfigurable PV modules, balancing losses under uniform conditions and gain under partial shading. First, feasible reconfigurable module instantiations are selected given some design constraints. Then, the search space is further reduced by taking into account the typical operating conditions of the module. Finally, the best module layouts are chosen based on performance consideration. Results for a specific case study are presented to show the feasibility of the proposed methodology.
{"title":"Optimization Methodology for Reconfigurable PV Modules","authors":"P. Manganiello, Pavlos Bosmalis, M. Baka, E. Voroshazi, D. Soudris, F. Catthoor, J. Szlufcik, J. Poortmans","doi":"10.1109/PVSC.2018.8548246","DOIUrl":"https://doi.org/10.1109/PVSC.2018.8548246","url":null,"abstract":"Reconfigurable photovoltaic modules represent an effective solution to improve PV system resilience to partial shading. Indeed, the availability of different configurations increases energy generation under non-uniform conditions. However, the additional components that are active under uniform conditions lead to higher losses compared to equivalent static solutions. This paper presents a methodology for the design of optimized reconfigurable PV modules, balancing losses under uniform conditions and gain under partial shading. First, feasible reconfigurable module instantiations are selected given some design constraints. Then, the search space is further reduced by taking into account the typical operating conditions of the module. Finally, the best module layouts are chosen based on performance consideration. Results for a specific case study are presented to show the feasibility of the proposed methodology.","PeriodicalId":6558,"journal":{"name":"2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)","volume":"1 1","pages":"3630-3634"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73730806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-01DOI: 10.1109/PVSC.2018.8548170
Christian J. Ruud, J. Price, Brent Fisher, Baoming Wang, N. Giebink
Concentrating photovoltaics (CPV) can increase the efficiency and reduce the cost of photovoltaic power in space. We introduce a new monolithic, ultrathin, and lightweight CPV paradigm based on a transfer-printed microscale solar cell array. In our reflective design, the microcell array is embedded in a radiation-tolerant glass optic that delivers 83% optical efficiency with a $pm mathbf{77} ^{circ}$ acceptance angle at $32 times$ geometric gain. The system is $<1$ mm thick and capable of achieving a specific power density of 352 W/kg using state-of-the-art triple junction microcells.
{"title":"Lightweight Monolithic Microcell CPV for Space","authors":"Christian J. Ruud, J. Price, Brent Fisher, Baoming Wang, N. Giebink","doi":"10.1109/PVSC.2018.8548170","DOIUrl":"https://doi.org/10.1109/PVSC.2018.8548170","url":null,"abstract":"Concentrating photovoltaics (CPV) can increase the efficiency and reduce the cost of photovoltaic power in space. We introduce a new monolithic, ultrathin, and lightweight CPV paradigm based on a transfer-printed microscale solar cell array. In our reflective design, the microcell array is embedded in a radiation-tolerant glass optic that delivers 83% optical efficiency with a $pm mathbf{77} ^{circ}$ acceptance angle at $32 times$ geometric gain. The system is $<1$ mm thick and capable of achieving a specific power density of 352 W/kg using state-of-the-art triple junction microcells.","PeriodicalId":6558,"journal":{"name":"2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)","volume":"54 1","pages":"3535-3538"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73895628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-01DOI: 10.1109/PVSC.2018.8547704
R. Saive, Hal S. Emmer, Christopher T. Chen, Chaomin Zhang, C. Honsberg, H. Atwater
We report on an study of the GaP/Si interface for application in silicon heterojunction solar cells. We analyzed the band alignment using X-ray photoelectron spectroscopy (XPS) and cross-sectional Kelvin probe force microscopy (x-KPFM). Our measurements show a high conduction band offset (0.9 eV) leading to a barrier in electron extraction which we microscopically resolved via x-KPFM. XPS reveals the presence of Si-Ga bonds which explains the observed interface dipole that leads to low open circuit voltage and low fill factor in GaP/Si heterojunction solar cells. Furthermore, we investigated the electronic and morphologic changes in GaP upon Si and Mg doping.
{"title":"GaP/Si Heterojunction Solar Cells: An Interface, Doping and Morphology Study","authors":"R. Saive, Hal S. Emmer, Christopher T. Chen, Chaomin Zhang, C. Honsberg, H. Atwater","doi":"10.1109/PVSC.2018.8547704","DOIUrl":"https://doi.org/10.1109/PVSC.2018.8547704","url":null,"abstract":"We report on an study of the GaP/Si interface for application in silicon heterojunction solar cells. We analyzed the band alignment using X-ray photoelectron spectroscopy (XPS) and cross-sectional Kelvin probe force microscopy (x-KPFM). Our measurements show a high conduction band offset (0.9 eV) leading to a barrier in electron extraction which we microscopically resolved via x-KPFM. XPS reveals the presence of Si-Ga bonds which explains the observed interface dipole that leads to low open circuit voltage and low fill factor in GaP/Si heterojunction solar cells. Furthermore, we investigated the electronic and morphologic changes in GaP upon Si and Mg doping.","PeriodicalId":6558,"journal":{"name":"2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)","volume":"38 1","pages":"2064-2069"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74068906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-01DOI: 10.1109/PVSC.2018.8548202
E. Lohmüller, Sabrina Lohmüller (née Werner), M. Norouzi, P. Saint‐Cast, J. Weber, Sebastian B. Meier, A. Wolf
We demonstrate a bifaciality of 88.0% for 6-inch bifacial p-type Cz-Si passivated emitter and rear cells (biPERC) and increase their rear side energy conversion efficiency to 18.0% by minor adaptions in the fabrication sequence. We utilize the “pPassDop” concept on the cells’ rear side that applies an aluminum oxide and a boron-doped silicon nitride (SiNX:B layer stack for simultaneous passivation and doping source. Laser doping forms the local p-doped back surface field regions for these biPERL solar cells. Screen-printed silver-aluminum metallization contacts these regions. We also demonstrate the compatibility of the laser doping approach with conventional (undoped) SiNX capping layer to fabricate biPERL devices with screen-printed contacts.
{"title":"Towards 90% Bifaciality for p-Type Cz-Si Solar Cells by Adaption of Industrial PERC Processes","authors":"E. Lohmüller, Sabrina Lohmüller (née Werner), M. Norouzi, P. Saint‐Cast, J. Weber, Sebastian B. Meier, A. Wolf","doi":"10.1109/PVSC.2018.8548202","DOIUrl":"https://doi.org/10.1109/PVSC.2018.8548202","url":null,"abstract":"We demonstrate a bifaciality of 88.0% for 6-inch bifacial p-type Cz-Si passivated emitter and rear cells (biPERC) and increase their rear side energy conversion efficiency to 18.0% by minor adaptions in the fabrication sequence. We utilize the “pPassDop” concept on the cells’ rear side that applies an aluminum oxide and a boron-doped silicon nitride (SiNX:B layer stack for simultaneous passivation and doping source. Laser doping forms the local p-doped back surface field regions for these biPERL solar cells. Screen-printed silver-aluminum metallization contacts these regions. We also demonstrate the compatibility of the laser doping approach with conventional (undoped) SiNX capping layer to fabricate biPERL devices with screen-printed contacts.","PeriodicalId":6558,"journal":{"name":"2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)","volume":"25 1","pages":"3727-3731"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74506772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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