Interfacial Bridge Using a cis‐Fulleropyrrolidine for Efficient Planar Perovskite Solar Cells with Enhanced Stability. Issue 5 (1st October 2019)

• Record Type: Journal Article
• Authors: Tian, Chengbo; Lin, Kebin; Lu, Jianxun; Feng, Wenjing; Song, Peiquan; Xie, Liqiang; Wei, Zhanhua
• Is Part Of: Small methods. Volume 4:Issue 5(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-10-01
• Subjects: chemical interactions -- energy level alignment -- fullerene derivatives -- passivation -- perovskite solar cells; Nanotechnology -- Methodology -- Periodicals; Nanotechnology -- Periodicals; Periodicals; 620.5028
• DOI: 10.1002/smtd.201900476
• Languages: English
• ISSNs: 2366-9608

Abstract

Abstract: Fullerene derivatives, especially after purposely functionalization, have potential to efficiently passivate interfacial defects between perovskites and electron transport layers. In this work, a fullerene derivative with amine functional group, 2, 5‐diphenyl C60 fulleropyrrolidine (DPC60 ), is synthesized and employed as an interfacial layer between a perovskite and SnO2 in planar perovskite solar cells (PSCs). The cis ‐configuration and the specific amine group of DPC60 effectively enhance the chemical interaction between the perovskite and DPC60, promoting the passivation of perovskite defects at the interface. The suitable energy level of DPC60 and the improved conductivity of the SnO2 /DPC60 film facilitate the electron extraction from the perovskite layer. As a result, PSCs incorporated with DPC60 reach a PCE of 20.4% with high reproducibility, which is much higher than that of the bare SnO2 based devices (18.8%). Furthermore, the hydrophobic DPC60 layer suppresses heterogeneous nucleation and improves the crystallinity of the perovskite film, resulting in better device stability, retaining 82% of its initial efficiency after 200 h of 1 sun continuous irradiation and thermal ageing (55 ± 5 °C). Abstract : A cis ‐fulleropyrrolidine with amine functional group, 2, 5‐diphenyl C60 fulleropyrrolidine (DPC60 ), is synthesized and applied for improving charge collection at a SnO2 /perovskite interface. Benefiting from an enhanced electron extraction capability, suppressed charge recombination, and improved perovskite film quality, the DPC60 modified SnO2 significantly enhances performance of the PSCs, yielding an impressive efficiency of 20.4% with relatively good stability.