Synergy of Front‐Surface Energy‐Level Gradient and Lattice Anchoring Effect for Enhancing Perovskite Solar Cell Performance
Author:
Guo Mingxuan1ORCID,
Pang Huimin1,
Chen Xingtong1,
Wan Peng1,
Xia Xueqing1,
Chen Song12ORCID
Affiliation:
1. Suzhou Key Laboratory of Novel Semiconductor‐Optoelectronics Materials and Devices College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou Jiangsu 215123 P. R. China
2. Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow University Suzhou Jiangsu 215123 P. R. China
Abstract
AbstractA front surface gradient of the absorber valence band can effectively reduce the open‐circuit voltage (VOC) loss of perovskite solar cells by suppressing the minority carrier concentration near the front surface. However, the existing method is limited to the one‐step fabrication process, resulting in underachieved photon harvesting and power conversion efficiency (PCE). To solve the problem, ZnCd‐based alloy quantum dots (QDs) are utilized to create a valence‐band‐maximum gradient at the front surface of a two‐step processed FAPbI3 absorber. This design significantly enhances VOC without requiring surface passivation. Furthermore, it is demonstrated that reducing the QD‐perovskite lattice mismatch while maintaining QD's energy levels mitigates nonradiative recombination without compromising the front surface gradient effect. As a result, normal‐structured perovskite solar cells achieve a VOC equivalent to 93% of the Schockley–Queisser limit and a PCE of 24.37%.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Natural Science Foundation of Jiangsu Province
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry