A Perylene‐Based Conjugated Polymer Endows Perovskite Solar Cells with 85 °C Durability: The Control of Gas Permeation. (27th October 2021)

• Record Type: Journal Article
• Authors: Zhang, Yuyan; Ren, Yutong; Xie, Xinrui; Wei, Yuefang; He, Lifei; Fang, Lingyi; Zhang, Jing; Yuan, Yi; Wang, Peng
• Is Part Of: Advanced functional materials. Volume 32:Number 6(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-10-27
• Subjects: conjugated polymers -- gas permeation -- hole transport -- perovskite solar cells -- thermal stability; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202108855
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Organic–inorganic hybrid perovskites in high‐efficiency solar cells are prone to degradation at elevated temperatures, especially in the presence of water moisture. A hole‐transporting conjugated copolymer (abbreviated as p‐NP‐E) characteristic of alternating N ‐annulated perylene and 3, 4‐ethylenedioxythiophene backbones, to achieve thermostable perovskite solar cells (PSCs) via controlling gas permeation and thus perovskite decomposition is reported. p‐NP‐E can be conveniently prepared via Pd‐catalyzed direct arylation polycondensation. The air‐doped p‐NP‐E composite film containing nonvolatile 4‐ tert ‐butylpyridinium bis(trifluoromethanesulfonyl)imide presents a higher hole mobility and an improved conductivity in comparison with the control based on the state‐of‐the‐art polymer, p‐TAA, leading to more efficient PSCs. More critically, the p‐NP‐E based hole transport layer is not only morphologically more heat‐resistant, but also features a lower solubility coefficient and diffusion coefficient of both environmental water molecules and gaseous products such as CH3 I and CH3 NH2 from the thermal decomposition of perovskite, enabling the fabrication of 21.7%‐efficiency, 85 °C durable solar cells. Abstract : A conjugated copolymer characteristic of alternating N ‐annulated perylene and 3, 4‐ethylenedioxythiophene backbones is prepared via direct arylation polycondensation and used for the fabrication of 21.7%‐efficiency, 85 °C durable perovskite solar cells. This study demonstrates the importance of developing a hole‐transporting material, which is not only morphologically heat‐resistant but also can control the thermal decomposition of organic–inorganic hybrid perovskites.