中间带太阳能电池中光载流子的收集:实验和等效电路分析

IF 1.5 4区 工程技术 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Photonics for Energy Pub Date : 2022-07-01 DOI:10.1117/1.JPE.12.032210
N. Ahsan, N. Miyashita, K. Yu, W. Walukiewicz, Y. Okada
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引用次数: 0

摘要

摘要高度不匹配合金(如III-V型gaas)的独特电子特性适用于中间带太阳能电池(IBSC)应用,其中中间带(IB)作为垫脚石,通过带隙下连续两步光子吸收(TSPA)在宿主半导体带隙中产生额外的光载流子。然而,在现实的gaas IBSC中,光载流子的收集量要低得多,并且在照明下的电流-电压(J-V)曲线中经常伴有s形扭结特征,这是缺乏相干图像的。基于利用分子束外延对加和不加阻挡、加和不加锑、加和不加铟的gaas IBSC器件的太阳能电池特性,以及利用等效电路模型对光载流子收集的分析,确定了该系统的TSPA和s形J-V取决于两个关键因素:(1)高载流子复合电流(I0CI)穿过导电带和中间带之间的gaas子隙(EgCI)和(2)AlGaAs IB电子势垒的反二极管效应。当晶格应变在GaInNAsSb外延层中进行补偿时,太阳能电池的s形J-V特性得到了显著改善。
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Collection of photocarriers in intermediate band solar cells: experiments and equivalent circuit analysis
Abstract. The unique electronic features of highly mismatched alloys such as III-V GaNAs are suitable for the intermediate band solar cell (IBSC) application, in which an intermediate band (IB) acts as a stepping stone to generate additional photocarriers across the host semiconductor bandgap through sequential two-step below-bandgap photon absorption (TSPA). However, the collection of photocarriers in a realistic GaNAs IBSC is much lower and often accompanies S-shape kink features in the current–voltage (J–V) curves under illumination for which a coherent picture is lacking. Based on the solar cell characterization of GaNAs IBSC devices grown with and without barriers, with and without antimony, and with and without indium using molecular beam epitaxy, and also with the photocarrier collection analysis using equivalent circuit models, it was identified that the TSPA and the S-shape J–V of this system depend on two critical factors: (1) high carrier recombination currents (I0CI) across the GaNAs sub-gap between the conduction- and intermediate bands (EgCI) and (2) the counterdiode effect of the AlGaAs IB electron barrier. Dramatic improvements in the S-shape J–V feature of the solar cell characteristics were achieved when lattice-strain was compensated in GaInNAsSb epitaxial layers.
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来源期刊
Journal of Photonics for Energy
Journal of Photonics for Energy MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS
CiteScore
3.20
自引率
5.90%
发文量
28
审稿时长
>12 weeks
期刊介绍: The Journal of Photonics for Energy publishes peer-reviewed papers covering fundamental and applied research areas focused on the applications of photonics for renewable energy harvesting, conversion, storage, distribution, monitoring, consumption, and efficient usage.
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