Highly Efficient Electron-Selective Layer Free Perovskite Solar Cells by Constructing Effective p-n Heterojunction
Highly Efficient Electron-Selective Layer Free Perovskite Solar Cells by Constructing Effective p-n Heterojunction
复制标题
DOI：
10.1002/solr.201600027
复制
发表时间：
2017-02-01
期刊：
影响因子：
7.9
通讯作者：
Li, Meicheng
中科院分区：
文献类型：
--
作者：
Cui, Peng;Wei, Dong;Li, Meicheng
提出了用n型自掺杂钙钛矿和p型空穴输运材料的异质结概念，用于制备高效的无电子选择层钙钛矿太阳能电池。钙钛矿的自掺杂性能由缺陷工程控制，可以由p型转变为n型，n型自掺杂程度由前驱体组成和工艺条件连续调节。同时，通过引入混合非极性非质子溶剂，获得致密均匀的大晶粒薄膜形态，从而达到致密化和晶粒尺寸的最佳平衡。因此，具有n型自掺杂致密CH3NH3PbI3薄膜的无esl PSCs表现出最高的效率（15.69%）。此外，与传统的平面PSCs相比，制备的无esl PSCs的初始效率可保持21天而不降解，表现出更好的长期稳定性。
A heterojunction concept with an n-type self-doped perovskite and a p-type hole-transport material was proposed for fabricating highly efficient electron-selective layer (ESL)-free perovskite solar cells (PSCs). The self-doping property of the perovskite is controlled by defects engineering, which can change from p-to n-type, and the n-type self-doping degree is tuned serially by precursor composition and process conditions. Meanwhile, the compact homogenous and large-grain film morphology is achieved by introducing mixed nonpolar aprotic solvents to obtain optimal balancing between densification and grain size. Hence, the ESL-free PSCs with n-type self-doped compact CH3NH3PbI3 film exhibit state of the art performance with the highest efficiency of 15.69%. Besides, the as-fabricated ESL-free PSCs, which keep their initial efficiencies for a period of 21 days without degradation, demonstrate better long-term stability compared to the conventional planar PSCs.