Open AccessGraded energy band engineering for efficient perovskite solar cells
Author(s) -
Cao Fengren,
Wang Meng,
Li Liang
Publication year - 2020
Publication title -
nano select
Language(s) - English
Resource type - Journals
ISSN - 2688-4011
DOI - 10.1002/nano.202000005
Subject(s) - perovskite (structure) , photovoltaics , optoelectronics , energy conversion efficiency , materials science , engineering physics , voltage , electronic band structure , open circuit voltage , electric field , photovoltaic system , band gap , solar energy , limit (mathematics) , energy transformation , nanotechnology , electrical engineering , engineering , physics , condensed matter physics , quantum mechanics , chemical engineering , thermodynamics , mathematical analysis , mathematics
Metal‐halide perovskite materials have attracted extensive attention in the field of photovoltaics due to their excellent optical and electrical properties. In just several years, the power conversion efficiency (PCE) of metal‐halide perovskite solar cells quickly increased from 3.8% to 25.2%. To further realize their theoretical PCE limit and improve their stability, matched energy levels at the interfaces among the perovskite device are critical. Appropriate energy‐level tailoring facilitates charge separation and transport, which contribute to increased open‐circuit voltage, short‐circuit current, and fill factor. In band engineering, the construction of the graded band structure can match the interfacial energy levels on both sides at the same time and provide a stronger build‐in electric field for carrier transfer. Herein, this review focuses on the graded band structure design, summarizes the recent application progress of the graded band structure in PSCs, and discusses possible promising research directions for further improvements.