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《Journal of Inorganic Materials》 2018-06
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Cooperative Effect of Carbon Nanotubes and Dimethyl Sulfoxide on PEDOT:PSS Hole Transport Layer in Planar Perovskite Solar cells

XU Shun-Jian;XIAO Zong-Hu;LUO Xiao-Rui;ZHONG Wei;LOU Yong-Ping;OU Hui;Xinyu Institute of New Energy, Xinyu University;  
Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS) film is commonly used as hole transport layer in planar perovskite solar cells(PSCs). To further strengthen the charge transport within PEDOT:PSS film and boost the growth of the perovskite crystal on PEDOT:PSS film, carbon nanotubes(CNTs) and dimethyl sulfoxide(DMSO) were simultaneously used as additives to prepare the co-modified film of CNT-DMSO-PEDOT:PSS. Results demonstrate an advantageous cooperative effect of CNTs and DMSO on the co-modified film. The dispersed CNTs with a grid-like structure throughout PEDOT:PSS matrix plays dual roles: to promote the perovskite crystal growth on co-modified surface and to reduce the sheet resistance of the co-modified film, while DMSO improves the conductivity of the co-modified film and controls the loss of CNTs from the co-modified film. Due to the cooperative effect, co-modified film is significantly more capable to collect, transport charges and enhance the perovskite layer growth with larger grains on its surface than that with pristine PEDOT:PSS film or PEDOT:PSS films modified by a single additive of CNT or DMSO, CNT-PEDOT:PSS or DMSO-PEDOT:PSS. Meanwhile, the co-modified film maintains high transparency with a transmittance of 88.8% at 550 nm. As a result, the PSCs of co-modified film has a hig power conversion efficiency of 5.75% in contrast to the devices based on the CNT-PEDOT:PSS(3.01%), DMSO-PEDOT:PSS(2.03%) and pristine PEDOT:PSS(1.30%) films.
【Fund】: 国家自然科学基金(51462035);; 江西省青年科学家培养对象计划(20133BCB23035);; 江西省自然科学基金(20161BAB206106);; 江西省高等学校科技落地计划(KJLD13100);; 江西省教育厅科技项目(GJJ171060)~~
【CateGory Index】: TM914.4
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