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arXiv 2103.15616cond-mat.mtrl-sciphysics.app-ph
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近表面缺陷:太阳能电池内部与外部开路电压差异的原因

Near surface defects: Cause of deficit between internal and external open-circuit voltage in solar cells

University of Luxembourg(卢森堡大学);Warsaw University of Technology(华沙理工大学)

Mohit Sood, Aleksander Urbaniak, Christian Kameni Boumenou, Thomas Weiss, Hossam Elanzeery, Finn Babbe, Florian Werner, Michele Melchiorre, Susanne Siebentritt

AI总结:

本文研究了铜铟二硒ide太阳能电池中近表面缺陷导致内部与外部开路电压差异的原因,通过实验和模拟揭示了界面复合机制。

摘要:

复杂多层薄膜太阳能结构中界面复合的存在导致内部开路电压(VOC,in)(通过光致发光测量)与外部开路电压(VOC,ex)之间存在差异,即额外的VOC亏损。更高的VOC,ex值要求对VOC亏损与界面复合之间的联系有全面理解。在此,为在Cu过剩条件下生长的铜铟二硒ide太阳能电池开发了一个深近表面缺陷模型,以解释VOC,in与VOC,ex之间的差异。该模型基于阻抗谱和深能级瞬态光谱的实验分析,显示出深受体缺陷的特征。进一步,温度依赖的电流-电压测量确认了近表面缺陷作为界面复合的原因。数值模拟显示,在吸收层/缓冲层界面附近局部VOC,in显著降低,导致器件中的VOC亏损。这种损失机制导致界面复合,而无需减少界面带隙或费米能级钉扎。此外,这些发现表明,仅凭VOC,in测量可能不充分,可能掩盖界面复合路径的信息,确立了需要互补技术如温度依赖的电流电压测量来确定器件中界面复合原因的必要性。

英文摘要:

The presence of interface recombination in a complex multilayered thin-film solar structure causes a disparity between the internal open-circuit voltage (VOC,in), measured by photoluminescence, and the external open-circuit voltage (VOC,ex) i.e. an additional VOC deficit. Higher VOC,ex value aim require a comprehensive understanding of connection between VOC deficit and interface recombination. Here, a deep near-surface defect model at the absorber/buffer interface is developed for copper indium di-selenide solar cells grown under Cu excess conditions to explain the disparity between VOC,in and VOC,ex.. The model is based on experimental analysis of admittance spectroscopy and deep-level transient spectroscopy, which show the signature of deep acceptor defect. Further, temperature-dependent current-voltage measurements confirm the presence of near surface defects as the cause of interface recombination. The numerical simulations show strong decrease in the local VOC,in near the absorber/buffer interface leading to a VOC deficit in the device. This loss mechanism leads to interface recombination without a reduced interface bandgap or Fermi level pinning. Further, these findings demonstrate that the VOC,in measurements alone can be inconclusive and might conceal the information on interface recombination pathways, establishing the need for complementary techniques like temperature dependent current voltage measurements to identify the cause of interface recombination in the devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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