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A Smooth CH3NH3PbI3 Film via a New Approach for Forming the PbI2 Nanostructure Together with Strategically High CH3NH3I Concentration for High Efficient Planar‐Heterojunction Solar Cells
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2015-09-28 , DOI: 10.1002/aenm.201501354 Hong Zhang 1 , Jian Mao 1 , Hexiang He 2 , Di Zhang 1 , Hugh L. Zhu 1 , Fengxian Xie 1 , Kam Sing Wong 2 , Michael Grätzel 3 , Wallace C. H. Choy 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2015-09-28 , DOI: 10.1002/aenm.201501354 Hong Zhang 1 , Jian Mao 1 , Hexiang He 2 , Di Zhang 1 , Hugh L. Zhu 1 , Fengxian Xie 1 , Kam Sing Wong 2 , Michael Grätzel 3 , Wallace C. H. Choy 1
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The photovoltaic performance of perovskite solar cells (PVSCs) is extremely dependent on the morphology and crystallization of the perovskite film, which is affected by the deposition method. In this work, a new approach is demonstrated for forming the PbI2 nanostructure and the use of high CH3NH3I concentration which are adopted to form high‐quality (smooth and PbI2 residue‐free) perovskite film with better photovoltaic performances. On the one hand, self‐assembled porous PbI2 is formed by incorporating small amount of rationally chosen additives into the PbI2 precursor solutions, which significantly facilitate the conversion of perovskite without any PbI2 residue. On the other hand, by employing a relatively high CH3NH3I concentration, a firmly crystallized and uniform CH3NH3PbI3 film is formed. As a result, a promising power conversion efficiency of 16.21% is achieved in planar‐heterojunction PVSCs. Furthermore, it is experimentally demonstrated that the PbI2 residue in perovskite film has a negative effect on the long‐term stability of devices.
中文翻译：
通过一种新的形成PbI2纳米结构的新方法形成光滑的CH3NH3PbI3膜，以及策略性地提高高效平面异质结太阳能电池的CH3NH3I浓度
钙钛矿太阳能电池（PVSC）的光伏性能非常依赖于钙钛矿薄膜的形貌和结晶，这受沉积方法的影响。在这项工作中，展示了一种新的方法来形成PbI 2纳米结构，并使用高浓度的CH 3 NH 3 I来形成具有更好光电性能的高质量（光滑且无PbI 2残留物）钙钛矿薄膜。一方面，通过在PbI 2前体溶液中掺入少量合理选择的添加剂来形成自组装多孔PbI 2，这极大地促进了钙钛矿的转化，而无需任何PbI 2。残留物。另一方面，通过采用相对较高的CH 3 NH 3 I浓度，形成牢固结晶且均匀的CH 3 NH 3 PbI 3膜。结果，平面异质结PVSC的功率转换效率有望达到16.21％。此外，实验证明钙钛矿薄膜中的PbI 2残留物对器件的长期稳定性具有负面影响。
更新日期：2015-09-28
中文翻译：
通过一种新的形成PbI2纳米结构的新方法形成光滑的CH3NH3PbI3膜，以及策略性地提高高效平面异质结太阳能电池的CH3NH3I浓度
钙钛矿太阳能电池（PVSC）的光伏性能非常依赖于钙钛矿薄膜的形貌和结晶，这受沉积方法的影响。在这项工作中，展示了一种新的方法来形成PbI 2纳米结构，并使用高浓度的CH 3 NH 3 I来形成具有更好光电性能的高质量（光滑且无PbI 2残留物）钙钛矿薄膜。一方面，通过在PbI 2前体溶液中掺入少量合理选择的添加剂来形成自组装多孔PbI 2，这极大地促进了钙钛矿的转化，而无需任何PbI 2。残留物。另一方面，通过采用相对较高的CH 3 NH 3 I浓度，形成牢固结晶且均匀的CH 3 NH 3 PbI 3膜。结果，平面异质结PVSC的功率转换效率有望达到16.21％。此外，实验证明钙钛矿薄膜中的PbI 2残留物对器件的长期稳定性具有负面影响。
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