Constructing Efficient and Stable Perovskite Solar Cells via Interconnecting Perovskite Grains
Constructing Efficient and Stable Perovskite Solar Cells via Interconnecting Perovskite Grains
复制标题
DOI：
10.1021/acsami.7b08488
复制
发表时间：
2017-10-11
影响因子：
9.5
通讯作者：
Chen, Xiaohong
中科院分区：
文献类型：
--
作者：
Hou, Xian;Huang, Sumei;Chen, Xiaohong
将对苯二甲酸（TPA）添加剂加入到钙钛矿前驱体溶液中，得到了高质量的钙钛矿膜。TPA的存在改变了钙钛矿薄膜的结晶动力学，促进了晶体边界附近晶粒的横向生长。结果形成片状的钙钛矿，并覆盖在底层颗粒上，使相邻的一些颗粒部分融合在一起，形成颗粒互连的钙钛矿膜。添加TPA的钙钛矿太阳能电池（PSCs）的功率转换效率（PCE）为18.51%，迟滞较小，明显高于未添加TPA的电池（15.53%）。未添加TPA和添加TPA的psc在未封装的空气中相对湿度为30%，老化35天后，PCE值分别保持18%和51%。此外，添加TPA的MAPbI(3)薄膜在100℃的烘烤下表现出比原始薄膜更好的热稳定性。结果表明，在钙钛矿薄膜中加入TPA可以显著提高聚苯乙烯复合材料的性能，提高其耐湿性和热稳定性。
A high-quality perovskite film with interconnected perovskite grains was obtained by incorporating terephthalic acid (TPA) additive into the perovskite precursor solution. The presence of TPA changed the crystallization kinetics of the perovskite film and promoted lateral growth of grains in the vicinity of crystal boundaries. As a result, sheet-shaped perovskite was formed and covered onto the bottom grains, which made some adjacent grains partly merge together to form grains-interconnected perovskite film. Perovskite solar cells (PSCs) with TPA additive exhibited a power conversion efficiency (PCE) of 18.51% with less hysteresis, which is obviously higher than that of pristine cells (15.53%). PSCs without and with TPA additive retain 18 and 51% of the initial PCE value, respectively, aging for 35 days exposed to relative humidity 30% in air without encapsulation. Furthermore, MAPbI(3) film with TPA additive shows superior thermal stability to the pristine one under 100 degrees C baking. The results indicate that the presence of TPA in perovskite film can greatly improve the performance of PSCs as well as their moisture resistance and thermal stability.