{"title":"Charge-transfer states at 2D metal halide perovskite/organic heterojunctions (Conference Presentation)","authors":"Lianfeng Zhao, YunHui L. Lin, Barry P Rand","doi":"10.1117/12.2320314","DOIUrl":"https://doi.org/10.1117/12.2320314","url":null,"abstract":"","PeriodicalId":445991,"journal":{"name":"Physical Chemistry of Semiconductor Materials and Interfaces XVII","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121613052","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}
Tracey M. Clarke, Kealan J. Fallon, Michelle S. Vezie, E. Salvadori, Jordan Shaikh, C. W. Kay, A. Bakulin, J. Nelson, Hugo Bronstein
{"title":"Recombination and charge transfer states in organic photovoltaics: from small molecules to ultra-low band gap polymers (Conference Presentation)","authors":"Tracey M. Clarke, Kealan J. Fallon, Michelle S. Vezie, E. Salvadori, Jordan Shaikh, C. W. Kay, A. Bakulin, J. Nelson, Hugo Bronstein","doi":"10.1117/12.2319926","DOIUrl":"https://doi.org/10.1117/12.2319926","url":null,"abstract":"","PeriodicalId":445991,"journal":{"name":"Physical Chemistry of Semiconductor Materials and Interfaces XVII","volume":"214 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115504142","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}
{"title":"Electronic properties of electronic material interfaces: their fundamentals and manipulation (Conference Presentation)","authors":"N. Koch","doi":"10.1117/12.2321315","DOIUrl":"https://doi.org/10.1117/12.2321315","url":null,"abstract":"","PeriodicalId":445991,"journal":{"name":"Physical Chemistry of Semiconductor Materials and Interfaces XVII","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117104705","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}
Continuous increase in the device performance of lead halide perovskite-based solar cells is strongly related to better understanding of the optoelectronic processes occurring in the perovskite layer and its interfaces. There are many of these processes that are critical to device performance, but are not yet fully understood, which include charge carrier accumulation and recombination, trapping of electrons and holes, and ionic movement. Here we report our recent results of methylammonium lead iodide (MAPI)-based photovoltaic devices identifying the origins of different open circuit voltages and their potential loss mechanisms in conventional and inverted device structures. We have investigated in detail the energetics and the illumination generated surface photovoltage (SPV) and its transient behaviour at the perovskite layer and its heterointerfaces with various charge extracting interlayers. A MAPI layer with different thicknesses was deposited on top of the various underlayers including ITO, n-type TiO2, p-type PEDOT:PSS and many oxides and organic semiconductors. We found that the work function of MAPI is strongly influenced by the underlayer showing generally p-type semiconductor character. The results of thickness dependent SPV measurements indicate that there is an increase in the hole concentration at both PEDOT:PSS/MAPI and TiO2/MAPI interfaces, which leads to an increased interfacial charge recombination. In this talk, I will discuss how these observations are related to different open circuit voltages and their loss in conventional and inverted devices. I will also discuss the temperature dependent transient SPV results, which is used to distinguish different processes governed by charge carrier generation, ion migration, and charge trapping – three processes taking place at three different timescales.
{"title":"Revealing the origins of open circuit voltage loss in perovskite solar cells by surface photovoltage measurement (Conference Presentation)","authors":"Ji‐Seon Kim","doi":"10.1117/12.2320328","DOIUrl":"https://doi.org/10.1117/12.2320328","url":null,"abstract":"Continuous increase in the device performance of lead halide perovskite-based solar cells is strongly related to better understanding of the optoelectronic processes occurring in the perovskite layer and its interfaces. There are many of these processes that are critical to device performance, but are not yet fully understood, which include charge carrier accumulation and recombination, trapping of electrons and holes, and ionic movement. Here we report our recent results of methylammonium lead iodide (MAPI)-based photovoltaic devices identifying the origins of different open circuit voltages and their potential loss mechanisms in conventional and inverted device structures. We have investigated in detail the energetics and the illumination generated surface photovoltage (SPV) and its transient behaviour at the perovskite layer and its heterointerfaces with various charge extracting interlayers. \u0000\u0000A MAPI layer with different thicknesses was deposited on top of the various underlayers including ITO, n-type TiO2, p-type PEDOT:PSS and many oxides and organic semiconductors. We found that the work function of MAPI is strongly influenced by the underlayer showing generally p-type semiconductor character. The results of thickness dependent SPV measurements indicate that there is an increase in the hole concentration at both PEDOT:PSS/MAPI and TiO2/MAPI interfaces, which leads to an increased interfacial charge recombination. In this talk, I will discuss how these observations are related to different open circuit voltages and their loss in conventional and inverted devices. I will also discuss the temperature dependent transient SPV results, which is used to distinguish different processes governed by charge carrier generation, ion migration, and charge trapping – three processes taking place at three different timescales.","PeriodicalId":445991,"journal":{"name":"Physical Chemistry of Semiconductor Materials and Interfaces XVII","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121706531","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}
S. Dimitrov, J. Durrant, I. McCulloch, B. Schroeder
{"title":"Charge losses in bulk-heterojunction organic solar cells on nanosecond timescale and the role of charge transfer states (Conference Presentation)","authors":"S. Dimitrov, J. Durrant, I. McCulloch, B. Schroeder","doi":"10.1117/12.2319932","DOIUrl":"https://doi.org/10.1117/12.2319932","url":null,"abstract":"","PeriodicalId":445991,"journal":{"name":"Physical Chemistry of Semiconductor Materials and Interfaces XVII","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114467169","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}
Daniel W Polak, Harriet Coulthard, R. Jayaprakash, Kealan J. Fallon, A. Leventis, Hugo Bronstein, J. Anthony, David G Lidzey, Jenny Clark, A. Musser
The interaction of organic semiconductors with confined light fields offers one of the easiest means to tune their material properties. In the regime of strong light-matter coupling, the semiconductor exciton and cavity photon mode hybridize to form new 'polariton' states. In organic systems these light-matter hybrids are tuneably separated by as much as 100’s of meV from the parent exciton, enabling radical alteration of the energetic landscape. The effects of strong coupling can be profound, including reports of long-range energy transfer, enhanced carrier mobility and altered chemical reactivity. Theoretical work is now increasingly focused on the potential of polariton to manipulate electronic dynamics in the excited state, but experimental realisation has proved challenging. Here, we demonstrate the ability to manipulate triplet photophysics in singlet exciton fission materials in the strong coupling regime. Within microcavities, we dramatically enhance the emission lifetime and increase delayed fluorescence by >100%, which we explain through a shift in the thermodynamic equilibrium between dark states in the exciton reservoir and the bright polaritons. Indeed, with this approach we can create entirely new radiative pathways, turning completely dark states bright and opening new scope for microcavity-controlled materials.
{"title":"A tale of two triplets: manipulating and harvesting triplet pairs with strong light-matter coupling (Conference Presentation)","authors":"Daniel W Polak, Harriet Coulthard, R. Jayaprakash, Kealan J. Fallon, A. Leventis, Hugo Bronstein, J. Anthony, David G Lidzey, Jenny Clark, A. Musser","doi":"10.1117/12.2321172","DOIUrl":"https://doi.org/10.1117/12.2321172","url":null,"abstract":"The interaction of organic semiconductors with confined light fields offers one of the easiest means to tune their material properties. In the regime of strong light-matter coupling, the semiconductor exciton and cavity photon mode hybridize to form new 'polariton' states. In organic systems these light-matter hybrids are tuneably separated by as much as 100’s of meV from the parent exciton, enabling radical alteration of the energetic landscape. The effects of strong coupling can be profound, including reports of long-range energy transfer, enhanced carrier mobility and altered chemical reactivity. Theoretical work is now increasingly focused on the potential of polariton to manipulate electronic dynamics in the excited state, but experimental realisation has proved challenging. Here, we demonstrate the ability to manipulate triplet photophysics in singlet exciton fission materials in the strong coupling regime. Within microcavities, we dramatically enhance the emission lifetime and increase delayed fluorescence by >100%, which we explain through a shift in the thermodynamic equilibrium between dark states in the exciton reservoir and the bright polaritons. Indeed, with this approach we can create entirely new radiative pathways, turning completely dark states bright and opening new scope for microcavity-controlled materials.","PeriodicalId":445991,"journal":{"name":"Physical Chemistry of Semiconductor Materials and Interfaces XVII","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132655679","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}
{"title":"QD-TSPP FRET systems for fluorescent sensing (Conference Presentation)","authors":"Yuqian Liu, Qingjiang Sun","doi":"10.1117/12.2320815","DOIUrl":"https://doi.org/10.1117/12.2320815","url":null,"abstract":"","PeriodicalId":445991,"journal":{"name":"Physical Chemistry of Semiconductor Materials and Interfaces XVII","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134330461","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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