Ran Chenxin, Wu Zhaoxin, Xi Jun, Yuan Fang, Dong Hua, Lei Ting, He Xin, Hou Xun
Key Laboratory of Photonics Technology for Information, Key Laboratory for Physical Electronics and Devices of the Ministry of Education, School of Electronic and Information Engineering, Xi'an Jiaotong University , Xi'an 710049, PR China.
J Phys Chem Lett. 2017 Jan 19;8(2):394-400. doi: 10.1021/acs.jpclett.6b02578. Epub 2017 Jan 5.
A bismuth-based organohalide material, methylammonium bismuth iodide (MABiI), has been recently explored as an efficient lead-free light absorber in photovoltaic applications. However, the poor surface morphology of the MABiI film fabricated via conventional one-step spin-coating methods has limited the performance of the device. In this work, a smooth, uniform, and compact MABiI thin film was realized by a novel two-step evaporation-spin-coating film fabrication strategy for the first time. Taking advantage of the superior MABiI thin film, the best-performing inverted planar heterojuncion photovoltaic device exhibited a power conversion efficiency of 0.39% with open-circuit voltage as high as 0.83 V, which demonstrated the lowest loss-in-potential to date in MABiI-based solar cells. Moreover, the facile film fabrication strategy utilized in this work paves the way for high reproducibility of lead-free organohalide films and devices.
一种铋基有机卤化物材料，碘化甲铵铋（MABiI），最近已被探索作为光伏应用中一种高效的无铅光吸收剂。然而，通过传统的一步旋涂法制备的MABiI薄膜表面形貌较差，限制了器件的性能。在这项工作中，首次通过一种新颖的两步蒸发-旋涂薄膜制备策略实现了光滑、均匀且致密的MABiI薄膜。利用这种优异的MABiI薄膜，性能最佳的倒置平面异质结光伏器件的功率转换效率为0.39%，开路电压高达0.83 V，这表明在基于MABiI的太阳能电池中，其潜在损失是迄今为止最低的。此外，这项工作中使用的简便薄膜制备策略为无铅有机卤化物薄膜和器件的高重现性铺平了道路。
