Liu Dan, Tang Rongfeng, Ma Yuyuan, Jiang Chenhui, Lian Weitao, Li Gang, Han Wenhao, Zhu Changfei, Chen Tao
Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui Province 230026, China.
Advanced Solar Power (Hangzhou) Inc., Hangzhou, Zhejiang Province 310000, China.
ACS Appl Mater Interfaces. 2021 Apr 28;13(16):18856-18864. doi: 10.1021/acsami.1c02393. Epub 2021 Apr 19.
Antimony selenide (SbSe) has attracted increasing attention in photovoltaic applications due to its unique quasi-one-dimensional crystal structure, suitable optical band gap with a high extinction coefficient, and excellent stability. As a promising light-harvesting material, the available synthetic methods for the fabrication of a high-quality film have been quite limited and seriously impeded both the fundamental study and the efficiency improvement. Here, we developed a facile and low-cost hydrothermal method for in situ deposition of SbSe films for solar cell applications. In this process, we apply KSbCHO and NaSeSO as the antimony and selenium sources, respectively, in which thiourea (TU) serves as an additive to suppress the formation of SbO impurities. As a result, improved phase purity and enhanced crystallinity of the SbSe film are thus obtained, along with decreased trap states. Finally, the planar heterojunction SbSe solar cell delivered a power conversion efficiency of 7.9%, which is thus far the highest reported efficiency among solution-processed SbSe solar cells. This simple procedure and efficiency achievement demonstrate the great potential of the hydrothermal deposition process for the fabrication of high-efficiency SbSe solar cells.
硒化锑（SbSe）因其独特的准一维晶体结构、具有高消光系数的合适光学带隙以及出色的稳定性，在光伏应用中受到越来越多的关注。作为一种有前景的光捕获材料，用于制备高质量薄膜的现有合成方法非常有限，严重阻碍了基础研究和效率提升。在此，我们开发了一种简便且低成本的水热法，用于原位沉积用于太阳能电池应用的SbSe薄膜。在此过程中，我们分别使用KSbCHO和NaSeSO作为锑源和硒源，其中硫脲（TU）用作添加剂以抑制SbO杂质的形成。结果，获得了改善的相纯度和增强的SbSe薄膜结晶度，同时陷阱态减少。最终，平面异质结SbSe太阳能电池的功率转换效率达到了7.9%，这是迄今为止溶液处理的SbSe太阳能电池中报道的最高效率。这一简单的工艺和效率成果证明了水热沉积工艺在制备高效SbSe太阳能电池方面的巨大潜力。
