Fabrication of efficient and stable perovskite solar cells in open air through adopting a dye interlayer. Issue 18 (22nd August 2022)

• Record Type: Journal Article
• Authors: Gu, Ningxia; Feng, Ye; Song, Lixin; Zhang, Pengyun; Du, Pingfan; Ning, Lei; Sun, Zeyuan; Chen, Xiang; Jiang, Hua; Xiong, Jie
• Is Part Of: Sustainable energy & fuels. Volume 6:Issue 18(2022)
• Page Start: 4275
• Page End: 4284
• Publication Date: 2022-08-22
• Subjects: Renewable energy sources -- Periodicals; Fuel cells -- Periodicals; Electric batteries -- Periodicals; Electrochemistry -- Periodicals; 660.297
• DOI: 10.1039/d2se00951j
• Languages: English
• ISSNs: 2398-4902

Abstract

Abstract : In this work, we synthesized a dye molecule, HQTh-EC, and used it as an interlayer to reduce trap density and to improve charge transport, achieving a PCE of 20.08% for planar PSCs with negligible hysteresis under air conditions without a glovebox. Abstract : Adding an interface passivation layer on the perovskite is one of the most effective methods to achieve high-efficiency and high-stability perovskite solar cells (PSCs). Herein, a novel dye molecule, namely ethyl-2-((6-hydroxyquinolin-5-yl)diazenyl)-4, 5, 6, 7-tetrahydrobenzo[ b ]thiophene-3-carboxylate (HQTh-EC), was synthesized and used as an interlayer between the perovskite absorber layer and the spiro-OMeTAD layer. It was found that the HQTh-EC passivation layer played various roles, such as effectively reducing defect states, enabling appropriate energy level alignment, restraining charge carrier recombination, and accelerating hole extraction. Consequently, the HQTh-EC-optimized PSCs delivered an outstanding power conversion efficiency (PCE) of 20.08%, much improved compared with that of the pristine PSCs (16.73%). Moreover, the HQTh-EC interlayer greatly enhanced the stability of PSCs, which retained 86% of their initial PCE after 400 h aging under ambient air with a relative humidity (RH) of 70–80%. This work provides a useful strategy to simultaneously enhance the performance and stability of PSCs by introduction of a dye interlayer, and will pave the way for fabricating high-performance planar devices under an air environment.