Trap State Passivation by Barbital Additive Toward Efficient Perovskite Solar Cells with 22.65% Efficiency. Issue 7 (9th June 2022)

• Record Type: Journal Article
• Authors: Peng, Yongshan; Liu, Xingchong; Zhang, Hua; Zhou, Ruonan; Luo, Huxin; Lei, Yue; Zou, Wenjing; Ni, Yafei; Li, Haimin; Wang, Hanyu
• Is Part Of: Energy technology. Volume 10:Issue 7(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-06-09
• Subjects: barbital -- improving film quality -- modifications -- passivation agents -- perovskite solar cells; Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.202200354
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract : In the organic–inorganic hybrid perovskite absorption layer as the composite center, it is easy to form defects and hinder the performance of solar cells. Here, barbital is introduced into perovskite films for the first time to enhance the photovoltaic performance of the device. It is demonstrated that the carbon‐based functional group in barbital additives can be used as Lewis bases to passivate the Lewis acid defects in perovskite films and promote the transmission of charge through grain boundaries. With the barbital in the perovskite film, the device efficiency is improved from 20.43% to 22.65% with the fill factor enhanced from 0.76 to 0.80. In addition, the perovskite films treated with barbital additive exhibit a lower density of filled trap states (3.07 × 10 17 cm −3 ) in perovskite grain boundaries, and a higher carrier lifetime (428.19 ns). This discovery provides a new tactic for the preparation of a high‐quality perovskite light‐absorbing layer. Abstract : Here, barbital is first introduced into perovskite films. The efficiency of the modified device is improved from 20.43% to 22.65% with the fill factor enhanced from 0.76 to 0.80. In addition, the modified perovskite film exhibits a lower density of filled trap states and higher carrier lifetime. This discovery provides a new tactic for the preparation of high‐quality perovskite light‐absorbing layers.