Huang Jielin, Wang Xuyang, Chen Yilin, Chen Zhenyu, Lin Qiaochu, Huang Qichuan, Qin Donghuan
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.
State Key Laboratory of Luminescent Materials & Devices, Institute of Polymer Optoelectronic Materials & Devices, South China University of Technology, Guangzhou 510640, China.
Nanomaterials (Basel). 2025 Jul 31;15(15):1180. doi: 10.3390/nano15151180.
CdTe nanocrystals (NCs) have emerged as a promising active layer for efficient thin-film solar cells due to their outstanding optical properties and simple processing techniques. However, the low hole concentration and high resistance in the CdTe NC active layer lead to high carrier recombination in the back contact. Herein, we developed a novel 2-iodothiophene as a wet etching solution to treat the surface of CdTe NC. We found that surface treatment using 2-iodothiophene leads to reduced interface defects and improves carrier mobility simultaneously. The surface properties of CdTe NC thin films after iodide salt treatment are revealed through surface element analysis, space charge limited current (SCLC) studies, and energy level investigations. The CdTe NC solar cells with 2-iodothiophene treatment achieved power conversion efficiency (PCE) of 4.31% coupled with a higher voltage than in controlled devices (with NHI-treated ones, 3.08% PCE).
碲化镉纳米晶体（NCs）因其出色的光学性能和简单的加工技术，已成为高效薄膜太阳能电池中一种很有前景的活性层。然而，碲化镉NC活性层中的低空穴浓度和高电阻导致背接触中的载流子复合率很高。在此，我们开发了一种新型的2-碘噻吩作为湿法蚀刻溶液来处理碲化镉NC的表面。我们发现，使用2-碘噻吩进行表面处理可减少界面缺陷并同时提高载流子迁移率。通过表面元素分析、空间电荷限制电流（SCLC）研究和能级研究揭示了碘盐处理后碲化镉NC薄膜的表面性质。经过2-碘噻吩处理的碲化镉NC太阳能电池实现了4.31%的功率转换效率（PCE），且电压高于对照器件（经NHI处理的器件，PCE为3.08%）。
