Lead-free, air-stable ultrathin Cs3Bi2I9 perovskite nanosheets for solar cells
Lead-free, air-stable ultrathin Cs3Bi2I9 perovskite nanosheets for solar cells
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DOI：
10.1016/j.solmat.2018.04.032
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发表时间：
2018-09-01
影响因子：
6.9
通讯作者：
Zhang, Shufang
中科院分区：
文献类型：
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作者：
Bai, Fan;Hu, Yonghong;Zhang, Shufang
有机金属卤化物钙钛矿材料由于其优异的光学性能和可溶液加工的制造方法，在过去几年中引起了极大的关注。然而，这些铅基材料的进一步发展受到有毒重金属元素Pb的限制。在此，我们提出了一种溶解-重结晶方法来制备高质量的无铅Cs3Bi2I9钙钛矿纳米片薄膜，并进一步探索其在三种不同空穴传输材料的太阳能电池中的潜在应用。基于超薄Cs3Bi2I9纳米片的太阳能电池在光伏性能方面表现出显着的改善，其中以CuI为空穴传输材料的太阳能电池实现了3.20%的高功率转换效率，这是迄今为止报道的Bi基钙钛矿太阳能电池的最高效率值。基于 Cs3Bi2I9 纳米片的 CuI 太阳能电池在环境空气中也表现出长期稳定性。我们的工作这些令人鼓舞的结果证明了进一步提高无铅钙钛矿太阳能电池性能的可能性。
Organometallic halide perovskite materials have attracted great attention in the past few years owing to their excellent optical properties and solution-processable fabrication. However, the further development of these lead-based materials is restricted by the toxic heavy-metal element Pb. Herein, we present a dissolution-re crystallization method to fabricate high-quality lead-free Cs3Bi2I9 perovskite nanosheets film and further explore its potential application in solar cells with three different kinds of hole transport materials. The solar cells based on ultrathin Cs3Bi2I9 nanosheets show remarkable improvement in the photovoltaic performance and a high power conversion efficiency of 3.20% has been achieved in the solar cell with CuI as the hole transport material, which is the highest efficiency value of Bi-based perovskite solar cells that has been reported so far. The Cs3Bi2I9 nanosheets based solar cell with CuI also showed a long-term stability in ambient air. These encouraging results of our work demonstrate the possibility of further improvement of the performance of lead-free perovskite solar cells.