An integrated organic–inorganic hole transport layer for efficient and stable perovskite solar cells. Issue 5 (16th January 2018)

• Record Type: Journal Article
• Authors: Guo, Yaxiong; Lei, Hongwei; Xiong, Liangbin; Li, Borui; Fang, Guojia
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 5(2018)
• Page Start: 2157
• Page End: 2165
• Publication Date: 2018-01-16
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta09946k
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Conjugated polymer FBT-Th4 and evaporation deposited Cu x O integrated hole transporting materials have been fabricated for efficient and stable perovskite solar cells. Abstract : Certified power conversion efficiencies (PCEs) of perovskite solar cells (PSCs) have increased to an impressive value of 22.1%. The most efficient perovskite solar cells have the n–i–p device architecture and use 2, 2′, 7, 7′-tetrakis( N, N ′-di- p -methoxyphenylamine)-9, 9′-spirobifluorene (spiro-OMeTAD) as the hole transport material (HTM). However, there exists microscopic inhomogeneity that is detrimental to the long-term performance of the solar cells, primarily as a result of the hygroscopicity of the lithium bis((trifluomethyl)sulfonyl)amide (LiTFSI) dopant. Here, we report a strategy for reducing heterogeneity by using an organic–inorganic integrated hole transport layer (HTL) composed of the solution-processable conjugated polymer FBT-Th4 and copper oxide (Cu x O). The optimized PSCs show significant performance enhancement with power conversion efficiency up to 18.85% from a reverse voltage scan and a stabilized champion efficiency of 18.24% with negligible hysteresis. Moreover, we observe a significant enhancement of the long-term stability of perovskite solar cells under a high humidity of 70–80% in air.