CH3NH3PbBr3 Quantum Dot-Induced Nucleation for High Performance Perovskite Light-Emitting Solar Cells

Peng Wang; Jiangsheng Xie; Ke Xiao; Haihua Hu; Can Cui; Yaping Qiang; Ping Lin; V Arivazhagan; Lingbo Xu; Zhengrui Yang; Yuxin Yao; Tao Lu; Zihan Wang; Xuegong Yu; Deren Yang

doi:10.1021/acsami.8b06595

CH₃NH₃PbBr₃ Quantum Dot-Induced Nucleation for High Performance Perovskite Light-Emitting Solar Cells

ACS Appl Mater Interfaces. 2018 Jul 5;10(26):22320-22328. doi: 10.1021/acsami.8b06595. Epub 2018 Jun 22.

Authors

Peng Wang^{1

2}, Jiangsheng Xie², Ke Xiao¹, Haihua Hu³, Can Cui¹, Yaping Qiang¹, Ping Lin¹, V Arivazhagan², Lingbo Xu¹, Zhengrui Yang², Yuxin Yao¹, Tao Lu¹, Zihan Wang¹, Xuegong Yu², Deren Yang²

Affiliations

¹ Center for Optoelectronics Materials and Devices, Department of Physics , Zhejiang Sci-Tech University , Hangzhou 310018 , China.
² State Key Laboratory of Silicon Materials and School of Material Science and Engineering , Zhejiang University , Hangzhou 310027 , China.
³ Zhejiang University City College , Hangzhou 310015 , China.

PMID: 29889489
DOI: 10.1021/acsami.8b06595

Abstract

Solution-processed organometallic halide perovskites have obtained rapid development for light-emitting diodes (LEDs) and solar cells (SCs). These devices are fabricated with similar materials and architectures, leading to the emergence of perovskite-based light-emitting solar cells (LESCs). The high quality perovskite layer with reduced nonradiative recombination is crucial for achieving a high performance device, even though the carrier behaviors are fundamentally different in both functions. Here CH₃NH₃PbBr₃ quantum dots (QDs) are first introduced into the antisolvent in solution phase, serving as nucleation centers and inducing the growth of CH₃NH₃PbI₃ films. The heterogeneous nucleation based on high lattice matching and a low free-energy barrier significantly improves the crystallinity of CH₃NH₃PbI₃ films with decreased grain sizes, resulting in longer carrier lifetime and lower trap-state density in the films. Therefore, the LESCs based on the CH₃NH₃PbI₃ films with reduced recombination exhibit improved electroluminescence and external quantum efficiency. The current efficiency is enhanced by 1 order of magnitude as LEDs, and meanwhile the power conversion efficiency increases from 14.49% to 17.10% as SCs, compared to the reference device without QDs. Our study provides a feasible method to grow high quality perovskite films for high performance optoelectronic devices.

Keywords: CH3NH3PbBr3 quantum dots; antisolvent; crystallinity; heterogeneous nucleation; perovskite light-emitting solar cells.