High-Hole-Mobility Metal-Organic Framework as Dopant-Free Hole Transport Layer for Perovskite Solar Cells

Ruonan Wang; Weikang Yu; Cheng Sun; Kashi Chiranjeevulu; Shuguang Deng; Jiang Wu; Feng Yan; Changsi Peng; Yanhui Lou; Gang Xu; Guifu Zou

doi:10.1186/s11671-021-03643-7

High-Hole-Mobility Metal-Organic Framework as Dopant-Free Hole Transport Layer for Perovskite Solar Cells

Nanoscale Res Lett. 2022 Jan 4;17(1):6. doi: 10.1186/s11671-021-03643-7.

Authors

Ruonan Wang^#¹, Weikang Yu^#^{1

2}, Cheng Sun^#¹, Kashi Chiranjeevulu³, Shuguang Deng⁴, Jiang Wu⁵, Feng Yan⁶, Changsi Peng⁷, Yanhui Lou⁸, Gang Xu⁹, Guifu Zou¹⁰

Affiliations

¹ College of Energy, Soochow Institute for Energy and Materials Innovations, and Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, 215123, People's Republic of China.
² School of Resources Environmental and Chemical Engineering, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, China.
³ State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, Fujian, China.
⁴ School for Engineering of Matter, Transport and Energy, Arizona State University, 551 E. Tyler Mall, Tempe, AZ, 85287, USA.
⁵ Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054, People's Republic of China.
⁶ College of Chemistry, Chemical Engineering and Materials Science, Soochow Universit, Suzhou, 215123, People's Republic of China.
⁷ School of Optoelectronic Science and Engineering and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006, People's Republic of China.
⁸ College of Energy, Soochow Institute for Energy and Materials Innovations, and Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, 215123, People's Republic of China. yhlou@suda.edu.cn.
⁹ State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, Fujian, China. gxu@fjirsm.ac.cn.
¹⁰ College of Energy, Soochow Institute for Energy and Materials Innovations, and Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, 215123, People's Republic of China. zouguifu@suda.edu.cn.

^# Contributed equally.

Abstract

A dopant-free hole transport layer with high mobility and a low-temperature process is desired for optoelectronic devices. Here, we study a metal-organic framework material with high hole mobility and strong hole extraction capability as an ideal hole transport layer for perovskite solar cells. By utilizing lifting-up method, the thickness controllable floating film of Ni₃(2,3,6,7,10,11-hexaiminotriphenylene)₂ at the gas-liquid interface is transferred onto ITO-coated glass substrate. The Ni₃(2,3,6,7,10,11-hexaiminotriphenylene)₂ film demonstrates high compactness and uniformity. The root-mean-square roughness of the film is 5.5 nm. The ultraviolet photoelectron spectroscopy and the steady-state photoluminescence spectra exhibit the Ni₃(HITP)₂ film can effectively transfer holes from perovskite film to anode. The perovskite solar cells based on Ni₃(HITP)₂ as a dopant-free hole transport layer achieve a champion power conversion efficiency of 10.3%. This work broadens the application of metal-organic frameworks in the field of perovskite solar cells.

Keywords: Dopant-free hole transport materials; High hole mobility; Metal–organic frameworks; Ni3(2,3,6,7,10,11-hexaiminotriphenylene)2; Perovskite solar cells.