Suppress the interfacial recombination between the MAPbI3 and PEDOT:PSS by mixing the nonionic surfactant
Dongguen Shin a, Donghee Kang a, Jae Bok Lee b, Jong-Hyun Ahn b, Il-Wook Cho c, Mee-Yi Ryu c, Sang Wan Cho d, Na Eun Jung a, Hyunbok Lee c, Yeonjin Yi a
a Institute of Physics and Applied Physics and van der Waals Materials Research Center, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Republic of Korea
b School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Republic of Korea
c Department of Physics, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Republic of Korea
d Department of Physics, Yonsei University, 1 Yonseidae-gil, Wonju-si, Gangwon-do 26493, Republic of Korea
Poster, Dongguen Shin, 134
Publication date: 23rd October 2018

The electronic structure at the interface greatly influence charge extraction and exciton quenching, and thus play a crucial role in the power conversion efficiency (PCE) of perovskite solar cells (PSCs). Among the hole transport materials, PEDOT:PSS is generally used material owing to its high conductivity and work function. However, the semi-metallic properties of PEDOT:PSS lead to the deterioration of PSCs performance by interfacial recombination. Thus suppression of the recombination at the methylammonium lead iodide (MAPbI3)/PEDOT:PSS interface is strongly demanded.

In this presentation, we survey the electronic structure of PEDOT:PSS with nonionic surfactant Triton X-100 (TX) mixture by using the X-ray and ultraviolet photoelectron spectroscopy, and X-ray absorption spectroscopy (XPS, UPS, and XAS) measurements, and demonstrate the enhancement in PCE of MAPbI3 PSCs by using the mixture of PEDOT:PSS and TX surfactant for the first time in PSCs. After that, we revealed that the efficient charge extraction HTL condition without the interfacial recombination on PSCs through the energy level diagram with the electrical and optical measurements. By mixing of TX, which led to the suppression of interfacial recombination as the insulating tunneling layer without energetic junction loss at the interface MAPbI3 with PEDOT:PSS.

This study was supported by National Research Foundation of Korea [NRF-2018R1D1A1B07051050, 2018R1A6A1A03025582, 2017R1A2B4002442, 2018K1A3A7A09057410, and 2017R1A5A1014862 (SRC program: vdWMRC center)], and MOTIE [Ministry of Trade, Industry & Energy (10079558)], and the Graduate School of Yonsei University Research Scholarship Grants in 2018.

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