Stabilizing heterostructures of soft perovskite semiconductors

Yanbo Wang; Tianhao Wu; Julien Barbaud; Weiyu Kong; Danyu Cui; Han Chen; Xudong Yang; Liyuan Han

doi:10.1126/science.aax8018

Stabilizing heterostructures of soft perovskite semiconductors

Science. 2019 Aug 16;365(6454):687-691. doi: 10.1126/science.aax8018.

Authors

Yanbo Wang¹, Tianhao Wu¹, Julien Barbaud¹, Weiyu Kong¹, Danyu Cui¹, Han Chen¹, Xudong Yang^{2

3}, Liyuan Han^{2

3

4}

Affiliations

¹ State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China.
² State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China. yang.xudong@sjtu.edu.cn han.liyuan@sjtu.edu.cn.
³ Center of Hydrogen Science, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
⁴ Photovoltaic Materials Group, Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan.

PMID: 31416961
DOI: 10.1126/science.aax8018

Abstract

Here we report a solution-processing strategy to stabilize the perovskite-based heterostructure. Strong Pb-Cl and Pb-O bonds formed between a [CH(NH₂)₂] _x [CH₃NH₃]_1- _x Pb₁₊ _y I₃ film with a Pb-rich surface and a chlorinated graphene oxide layer. The constructed heterostructure can selectively extract photogenerated charge carriers and impede the loss of decomposed components from soft perovskites, thereby reducing damage to the organic charge-transporting semiconductors. Perovskite solar cells with an aperture area of 1.02 square centimeters maintained 90% of their initial efficiency of 21% after operation at the maximum power point under AM1.5G solar light (100 milliwatts per square centimeter) at 60°C for 1000 hours. The stabilized output efficiency of the aged device was further certified by an accredited test center.

Publication types

Research Support, Non-U.S. Gov't