Affiliation:
1. National Key Laboratory of Electronic Thin Films and Integrated Devices School of Integrated Circuit Science and Engineering University of Electronic Science and Technology of China Chengdu 610054 P. R. China
2. Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen 518110 P. R. China
3. Dongguan Neutron Science Center Dongguan 523803 P. R. China
4. State Key Laboratory of Applied Organic Chemistry School of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 P. R. China
Abstract
AbstractWith the rapid development in perovskite solar cell (PSC), high efficiency has been achieved, but the long‐term operational stability is still the most important challenges for the commercialization of this emerging photovoltaic technology. So far, bi‐dopants lithium bis(trifluoromethylsulfonyl)‐imide (Li‐TFSI)/4‐tert‐butylpyridine (t‐BP)‐doped hole‐transporting materials (HTM) have led to state‐of‐the art efficiency in PSCs. However, such dopants have several drawbacks in terms of stability, including the complex oxidation process, undesirable ion migration and ultra‐hygroscopic nature. Herein, a fluorine‐containing organic Lewis acid dopant bis(pentafluorophenyl)zinc (Zn‐FP) with hydrophobic property and high migration barrier has been employed as a potential alternative to widely employed bi‐dopants Li‐TFSI/t‐BP for poly[bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine] (PTAA). The resulting Zn‐FP‐based PSCs achieve a maximum PCE of 20.34 % with hysteresis‐free current density‐voltage (J‐V) scans. Specifically, the unencapsulated device exhibits a significantly advanced of operational stability under the International Summit on Organic Photovoltaic Stability protocols (ISOS−L‐1), maintaining over 90 % of the original efficiency after operation for 1000 h under continuous 1‐sun equivalent illumination in N2 atmosphere in both forward and reverse J‐V scan.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Subject
General Energy,General Materials Science,General Chemical Engineering,Environmental Chemistry