Affiliation:
1. Key Laboratory of Macromolecular Science of Shaanxi Province School of Chemistry and Chemical Engineering Shaanxi Normal University Xi'an 710119 China
2. Institute of Nanoscience and Nanotechnology School of Materials and Energy Lanzhou University Lanzhou Gansu 730000 China
3. Laboratory of Applied Surface and Colloid Chemistry Ministry of Education School of Materials Science and Engineering Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials Shaanxi Normal University Xi'an 710119 China
4. Dalian National Laboratory for Clean Energy iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China
Abstract
The efficiency of perovskite solar cells (PSCs) has surpassed all other thin‐film solar cells. It is well known that the mismatch between the perovskite film and electron transport layer is an important factor to damage the stability of PSCs. Herein, an effective modification strategy to improve stability by using FAI@ZIF‐8 is demonstrated. It is found that the FAI@ZIF‐8 modification reduces the trap‐state density of the perovskite by slowly releasing FAI from the ZIF‐8 pore. Besides, FAI@ZIF‐8 improves energy‐level alignment at TiO2/perovskite interface, which facilitates electron extraction at the interface. As a consequence, an optimal power conversion efficiency (PCE) of 23.52% is achieved for the FAI@ZIF‐8‐treated PSCs. After storing under 20–30% relative humidity and room temperature for 2000 h, the FAI@ZIF‐8‐treated device sustains 96% of its initial PCE; nevertheless, the control device maintains only 73% of its initial PCE under the same conditions. This strategy is helpful to guide the development of high‐performance PSCs and promotes commercialization of perovskite materials.
Funder
Key Laboratory of Highway Construction and Maintenance Technology in the Loess Region of Shanxi Transportation Research Institute
Shanghai Institute of Technical Physics, Chinese Academy of Sciences
National Natural Science Foundation of China
National Center for Inter-University Research Facilities, Seoul National University
Innovative Research Group Project of the National Natural Science Foundation of China
Higher Education Discipline Innovation Project
Subject
Electrical and Electronic Engineering,Energy Engineering and Power Technology,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials