Simultaneous barrier reduction and effective doping in CdTe solar cells using CuBr

IF 2.4 4区材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS

Thin Solid Films Pub Date : 2025-11-01 Epub Date: 2025-09-28 DOI:10.1016/j.tsf.2025.140806

Banghua Liu , Ziwei Xu , Shiyu Yuan , Fu You , Xin Zhang , Yunpu Tai , Di Zhang , Komiljon Yakubov , Jingquan Zhang , Chebotareva Alla , Guanggen Zeng

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引用次数: 0

Abstract

Introducing a back-contact material is a crucial strategy for enhancing the efficiency of cadmium telluride (CdTe) solar cells. This work pioneers the application of a solution-processed copper(I) bromide (CuBr) layer as an efficient back-contact for CdTe solar cells. The CuBr layer serves a dual purpose: it effectively reduces the back-contact barrier, as evidenced by the elimination of the upward bending in Mott-Schottky curves and the "roll-over" phenomenon in dark current density-voltage characteristics, and it acts as a source for copper doping into the CdTe absorber. This doping increases the hole concentration, leading to a significant enhancement in the apparent carrier density and a reduced saturation dark current density. Consequently, key device parameters were substantially improved, including an increase in open-circuit voltage (from 788 mV to 824 mV) and a reduction in series resistance (from 4.45 Ω·cm² to 2.90 Ω·cm²). Ultimately, an optimized device with an FTO/MZO/CdSe/CdTe/CuBr/Au structure achieved a power conversion efficiency of 14.7 %.

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利用cur在CdTe太阳能电池中同时降低障垒和有效掺杂

引入背接触材料是提高碲化镉（CdTe）太阳能电池效率的关键策略。这项工作开创了溶液处理的溴化铜（CuBr）层作为CdTe太阳能电池的有效背触点的应用。cur层有双重作用：它有效地减少了背接触障壁，这可以通过消除莫特-肖特基曲线的向上弯曲和暗电流密度-电压特性中的“翻转”现象来证明，它可以作为铜掺杂到CdTe吸收器中的来源。这种掺杂增加了空穴浓度，导致表观载流子密度的显著增强和饱和暗电流密度的降低。因此，关键器件参数得到了实质性改善，包括开路电压增加（从788 mV到824 mV）和串联电阻降低（从4.45 Ω·cm2到2.90 Ω·cm2）。最终，FTO/MZO/CdSe/CdTe/ cur /Au结构优化器件的功率转换效率达到14.7%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thin Solid Films 工程技术-材料科学：膜

CiteScore

4.00

自引率

4.80%

发文量

381

审稿时长

7.5 months

期刊介绍： Thin Solid Films is an international journal which serves scientists and engineers working in the fields of thin-film synthesis, characterization, and applications. The field of thin films, which can be defined as the confluence of materials science, surface science, and applied physics, has become an identifiable unified discipline of scientific endeavor.