中国科学院化学研究所薛丁江述评：非原位铋掺杂实现高效CdSeTe太阳能电池 | Cell Press青促会述评

目前，CdSeTe薄膜太阳能电池的掺杂已从铜（Cu）掺杂转变为V族元素掺杂。原位V族元素掺杂已实现了22.6%的最高转换效率（PCE），和超过900 mV的开路电压（V_ocs）。在此，我们报道了非原位铋（Bi）掺杂的V_oc超过900 mV的CdSeTe薄膜太阳能电池，且光电转换效率达到了20.6%。研究结果表明，在含有硒的CdSeTe区域，Bi离子占据阴离子位点，并使该区域为弱p型，在以CdTe为主的背面区域，Bi离子占据阳离子位点并被氧化。这种非原位Bi掺杂具有多种优势，包括操作简单、对操作环境的具有高耐受性，不需要额外的Cd蒸汽或特殊的活化过程，这都使得研究人员能够很容易地探索高效Bi掺杂CdSeTe薄膜太阳能电池。

The focus of CdSeTe thin-film solar cell doping has transitioned from copper (Cu) doping to group V doping. In situ group V doping has resulted in a new record power conversion efficiency (PCE) of 22.6%, with opencircuit voltages (V_ocs) exceeding the 900-mV mark. Here, we report that ex situ bismuth (Bi)-doped CdSeTe thin-film solar cells show V_ocs exceeding 900 mV and a champion PCE of 20.6%. Characterizations revealed that the Se-rich CdSeTe region near the front junction promotes Bi ions to occupy the anion sites and dope this region weakly p-type. Bi ions in the CdTe-dominating back surface region occupy the cation sites and are oxidized. This ex situ Bi doping with BiF3 as a dopant precursor offers several advantages, including simplicity, high tolerance to the processing environment, and no requirement of additional Cd vapor or special activation processes, making it highly adaptable for researchers to explore efficient Bi-doped CdSeTe thin-film solar cells.

薛丁江，中国科学院化学研究所研究员，国家优秀青年基金获得者，中国科学院青年创新促进会优秀会员。2013年于中国科学院化学研究所获得博士学位。2013-2015年在华中科技大学（武汉光电国家研究中心）从事博士后研究工作。2018-2019年在加拿大多伦多大学从事访问学者研究工作。2016年入职于中国科学院化学研究所纳米结构与纳米技术院重点实验室，现任研究员。主要从事光伏材料与器件方面的研究工作。在Nat. Commun.、Sci. Adv.、J. Am. Chem. Soc.、Joule、Adv. Mater.、Angew. Chem. 等期刊上发表SCI论文40余篇。担任 《InfoMat》《Chinese Journal of Chemistry》《Carbon Neutralization》《eScience》《InfoScience》等期刊青年编委、中国可再生能源学会青委会委员。获得中国科学院优秀博士论文、中国科学院院长优秀奖等。

Ding-jiang Xue is a researcher at the Institute of Chemistry, Chinese Academy of Sciences (CAS), a recipient of the National Excellent Young Scientist Fund, and an outstanding member of the CAS Youth Innovation Promotion Association. He obtained his PhD from the Institute of Chemistry, CAS, in 2013. From 2013 to 2015, he conducted postdoctoral research at the Huazhong University of Science and Technology (Wuhan National Laboratory for Optoelectronics). From 2018 to 2019, he worked as a visiting scholar at the University of Toronto, Canada. In 2016, he joined the Key Laboratory of Nanostructures and Nanotechnology at the Institute of Chemistry, CAS, where he is currently a researcher. His research primarily focuses on photovoltaic materials and devices. He has published over 40 SCI papers in journals such as Nature Communications, Science Advances, Journal of the American Chemical Society, Joule, Advanced Materials, and Angewandte Chemie. He serves as a youth editorial board member for journals including InfoMat, Chinese Journal of Chemistry, Carbon Neutralization, eScience, and InfoScience. He is also a member of the Youth Committee of the Chinese Renewable Energy Society. He has received the CAS Excellent Doctoral Thesis Award and the CAS President's Excellent Award, among other honors.