Cooperative effect of carbon black and dimethyl sulfoxide on PEDOT:PSS hole transport layer for inverted planar perovskite solar cells. (15th November 2017)

• Record Type: Journal Article
• Authors: Xu, Shunjian; Liu, Can; Xiao, Zonghu; Zhong, Wei; Luo, Yongping; Ou, Hui; Wiezorek, Jörg
• Is Part Of: Solar energy. Volume 157(2017)
• Page Start: 125
• Page End: 132
• Publication Date: 2017-11-15
• Subjects: PEDOT:PSS -- Carbon black -- Dimethyl sulfoxide -- Perovskite solar cells; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2017.08.009
• Languages: English
• ISSNs: 0038-092X

Abstract

Highlights: Carbon black (CB) and DMSO co-modified PEDOT:PSS was developed as HTL in PSC. Cooperative effect of CB and DMSO in the co-modified HTL was observed. CB mainly assisted perovskite growth while DMSO chiefly enhanced conductivity. Co-modified HTL kept a high transmittance of 89.8% at 550 nm. Co-modified HTL used in PSC was superior to pristine and single-modified HTLs. Abstract: A nanocomposite film based on poly(3, 4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) modified with dual additives of carbon black (CB) and dimethyl sulfoxide (DMSO) was developed as a hole transport layer (HTL) in inverted planar perovskite solar cells (PSCs) for the first time. Taking advantage of the cooperative effect of CB and DMSO, the co-modified film of CB-DMSO-PEDOT:PSS shows superior capabilities to collect and transport the charge induced by reduced sheet resistance and to assist the growth of perovskite light harvest layer with enlarged grains in micron scale on its surface when compared with the single-modified films of CB-PEDOT:PSS and DMSO-PEDOT:PSS as well as the pristine film of PEDOT:PSS. Meanwhile, the co-modified film still preserves high transparency in the visible range with a transmittance of 89.8% at 550 nm and do not alter the transparency of the pristine film greatly. As a result, the PSCs made on the co-modified film as a HTL possess higher short-circuit photocurrent density and open-circuit voltage than the devices based on the single-modified and pristine films, leading to a remarkable enhancement in the power conversion efficiency.