Qi Jun, Yao Xiang, Xu Wenzhan, Wu Xiao, Jiang Xiaofang, Gong Xiong, Cao Yong
Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou 510640, P. R. China.
Department of Polymer Engineering, College of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325, United States.
ACS Omega. 2018 Jun 28;3(6):7069-7076. doi: 10.1021/acsomega.8b01061. eCollection 2018 Jun 30.
Hybrid perovskite materials used for realization of efficient perovskite solar cells have drawn great attention in both academic and industrial sectors. It was reported that the crystallinity of hybrid thin-film perovskite materials plays an important role in device performance. In this study, we report a novel and simple method to tune the crystallinity of CHNHPbI thin film for device performance of perovskite solar cells. By employing tetraphenylphosphonium chloride on the top of PbI thin layer in the two-step perovskite deposition processes, the crystallinity of the resultant CHNHPbI thin film was tuned. As a result, perovskite solar cells by the CHNHPbI thin film with tuned crystallinity exhibit an enlarged open-circuit voltage and enhanced short-circuit current, thus boosted efficiency as well as reduced photocurrent hysteresis compared to pristine CHNHPbI thin film. These results indicate that our study provides a new simple way to boost device performance of perovskite solar cells through tuning the crystallinity of CHNHPbI thin film.
用于实现高效钙钛矿太阳能电池的混合钙钛矿材料在学术和工业领域都引起了极大关注。据报道，混合薄膜钙钛矿材料的结晶度在器件性能中起着重要作用。在本研究中，我们报告了一种新颖且简单的方法来调节CH₃NH₃PbI薄膜的结晶度，以改善钙钛矿太阳能电池的器件性能。在两步钙钛矿沉积过程中，通过在PbI₂薄层顶部使用四苯基氯化鏻，调节了所得CH₃NH₃PbI薄膜的结晶度。结果，与原始CH₃NH₃PbI薄膜相比，具有调节结晶度的CH₃NH₃PbI薄膜制成的钙钛矿太阳能电池表现出扩大的开路电压和增强的短路电流，从而提高了效率并减少了光电流滞后。这些结果表明，我们的研究提供了一种新的简单方法，通过调节CH₃NH₃PbI薄膜的结晶度来提高钙钛矿太阳能电池的器件性能。
