Controlled growth of textured perovskite films towards high performance solar cells
Controlled growth of textured perovskite films towards high performance solar cells
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结构化钙钛矿薄膜的受控生长用于高性能太阳能电池
DOI：
10.1016/j.nanoen.2016.06.041
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发表时间：
2016-09-01
期刊：
影响因子：
17.6
通讯作者：
Cao, Guozhong
中科院分区：
文献类型：
--
作者：
Fei, Chengbin;Guo, Lixue;Cao, Guozhong
抗溶剂沉淀法以其显著的加速晶化过程而成为制备致密、光滑、均匀的高效太阳能电池钙钛矿薄膜的首选策略之一。然而，过快的晶化制约了光伏性能的进一步提高。在本工作中，我们在原始的CH3NH3PbI3前驱体中引入CH3NH3Cl，在低温下进行抗溶剂沉淀，制备出了具有所需形貌、结晶度和光学性能的高质量钙钛矿薄膜。X射线衍射仪和紫外可见光谱提供了充分的证据，证明CH3NH3Cl通过控制PbI2从中间相CH3NH3PbI2Cl的输送速度，对钙钛矿结晶过程产生了显著的影响。首先阐述了钙钛矿形成过程中可能发生的反应。所制得的太阳能电池的平均功率转换效率约为16.63%，在标准光照条件下的最佳转换效率为17.22%。此外，通过普通的阻抗测量首次检测到了钙钛矿型太阳能电池中的离子迁移。(C)2016爱思唯尔有限公司。保留所有权利。
Antisolvent precipitation method has been one of the favored strategies to fabricate compact, smooth and uniform perovskite films for high efficiency solar cells due to its dramatically accelerated crystallization process. However, the excessively fast crystallization restricted the further improvement of the photovoltaic performance. In this work, we introduced CH3NH3Cl into the pristine CH3NH3PbI3 precursor for antisolvent precipitation at low temperature and fabricated high quality perovskite films with desired morphology, crystallinity and optical properties. The X-ray diffractometry and ultraviolent-visible spectroscopy provided ample evidence that CH3NH3Cl exerted significant impacts on the perovskite crystallization process by controlling the delivery speed of PbI2 from the intermediate phase CH3NH3PbI2Cl. The possible reactions in the perovskite formation process were first elaborated. The resultant solar cells demonstrated an average power conversion efficiency around 16.63% and a best efficiency at 17.22% under the standard light illumination condition. In addition, the ion migration was first detected in the perovskite solar cells by an ordinary impedance measurement. (C) 2016 Elsevier Ltd. All rights reserved.