Enhancing the photovoltaic performance of planar heterojunction perovskite solar cells via introducing binary-mixed organic electron transport layers. (22nd February 2023)

• Record Type: Journal Article
• Authors: Wang, Shiqi; Wang, Binbin; He, Shilong; Wang, Yaowu; Cheng, Jiawei; Li, Yao
• Is Part Of: New journal of chemistry. Volume 47:Number 10(2023)
• Page Start: 5048
• Page End: 5055
• Publication Date: 2023-02-22
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj05127c
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Binary-mixed organic electron transport layers exhibit suitable energy level alignment, prevent moisture intrusion, alleviate aggregation, and thus improve the photovoltaic performance of inverted perovskite solar cells. Abstract : Optimizing electron transport layers (ETLs) is a significant way to enhance the photovoltaic performance and stability of inverted perovskite solar cells (PSCs). Herein, we introduce a strategy focused on binary-mixed organic ETLs, which dopes an n-type small organic molecule, m -ITTC, into the fullerene [6, 6]-phenyl C 61 -butyric acid methyl ester (PCBM) ETLs to fabricate a binary-mixed organic ETLs for use in inverted PSCs. The binary-mixed organic ETLs have suitable energy level alignment at the interface between the perovskite and ETLs, and thus the charge recombination behavior is modified. The PSCs modified with the binary-mixed organic ETLs exhibit a power conversion efficiency (PCE) of 15.62% with negligible hysteresis. Additionally, the binary-mixed organic ETLs can not only effectively prevent moisture intrusion, but also alleviate aggregation under continuous operation, so as, compared to PCBM ETLs, the devices with the binary-mixed organic ETLs exhibit better stability with a T95 of the best-performing devices exceeding 200 h. This work represents a simple and effective way to enhance the efficiency and stability of PSCs.