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Alcohol Vapor Post‐Annealing for Highly Efficient Sb 2 S 3 Planar Heterojunction Solar Cells
Author(s) -
Han Jian,
Wang Shuangjie,
Li Xuanhua,
Tang Huijie,
Cao Qi,
Yang Jiabao,
Zhu Jinmeng,
Liu Xingrui,
Li Zhen,
Liu Weimin
Publication year - 2019
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201900133
Subject(s) - crystallinity , annealing (glass) , materials science , heterojunction , energy conversion efficiency , photocurrent , optoelectronics , suns in alchemy , solar cell , photoluminescence , chemical engineering , analytical chemistry (journal) , chemistry , composite material , organic chemistry , engineering
Solution‐processed Sb 2 S 3 planar heterojunction solar cells have shown great progress in power conversion efficiency (PCE) in recent years. However, a conventional solution process yields Sb 2 S 3 films with a small grain size. Herein, an alcohol vapor post‐annealing strategy is reported that uses alcohol vapors to facilitate grain growth of Sb 2 S 3 films during annealing, achieving films with a larger grain size and better crystallinity. A series of alcohols with different polarities are used for the vapor post‐annealing. Methanol with the highest polarity provides films with the largest grain size. As a result, the Sb 2 S 3 films prepared via vapor post‐annealing show enhanced light absorption, longer carrier lifetime, and less carrier recombination, which are verified by photoluminescence, transient photovoltage, suns‐short‐circuit photocurrent density, and suns‐open‐circuit voltage measurements. The Sb 2 S 3 solar cells post‐annealed with methanol vapor exhibit a PCE of 5.27%, showing a drastic improvement of 31% compared with the non‐treated devices. The alcohol vapor post‐annealing approach presents a new avenue toward controlling the morphology and crystallinity of solution‐processed Sb 2 S 3 films and achieving efficient Sb 2 S 3 solar cells.