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Investigation of Inverted Perovskite Solar Cells for Viscosity of PEDOT:PSS Solution

Institute of Microelectronics, Department of Electrical Engineering, National Cheng Kung University, Tainan 70101, Taiwan
Department of Applied Physics, National University of Kaohsiung, Nanzih, Kaohsiung 81148, Taiwan
Department of Electronic Engineering, National Formosa University, Yunlin 632, Taiwan
Author to whom correspondence should be addressed.
Crystals 2018, 8(9), 358;
Received: 31 July 2018 / Revised: 16 August 2018 / Accepted: 28 August 2018 / Published: 6 September 2018
PDF [1463 KB, uploaded 18 September 2018]


In this paper, we demonstrate that the inverted CH3NH3PbI3 (perovskite) solar cells (PSCs) based on fullerene (C60) as an acceptor is fabricated by applying an improved poly(3,4-ethlyenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) solution as a hole transport layer (HTL). The power conversion efficiency (PCE) of inverted PSCs is increased by 37.5% with stable values of open-circuit voltage (VOC) and fill factor (FF) because we enhance the viscosity of the PEDOT:PSS solution, indicating the perfect effect on both external quantum efficiency (EQE) and surface grain size. The characteristics of the PEDOT:PSS solution, which is being improved through facile methods of obtaining excellent growth of PEDOT:PSS thin film, have a considerable impact on carrier transport. A series of further processing fabrications, including reliable and feasible heating and stirring techniques before the formation of the PEDOT:PSS thin film via spin-coating, not only evaporate the excess moisture but also obviously increase the conductivity. The raised collection of holes become the reason for the enhanced PCE of 3.0%—therefore, the stable performance of FF and VOC are attributed to lower series resistance of devices and the high-quality film crystallization of perovskite and organic acceptors, respectively. View Full-Text
Keywords: perovskite; PEDOT:PSS solution; heating and stirring; solar cells perovskite; PEDOT:PSS solution; heating and stirring; solar cells

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Huang, P.-H.; Wang, Y.-H.; Huang, C.-W.; Chen, W.-R.; Huang, C.-J. Investigation of Inverted Perovskite Solar Cells for Viscosity of PEDOT:PSS Solution. Crystals 2018, 8, 358.

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