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Crystals 2018, 8(9), 358; https://doi.org/10.3390/cryst8090358

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

1
Institute of Microelectronics, Department of Electrical Engineering, National Cheng Kung University, Tainan 70101, Taiwan
2
Department of Applied Physics, National University of Kaohsiung, Nanzih, Kaohsiung 81148, Taiwan
3
Department of Electronic Engineering, National Formosa University, Yunlin 632, Taiwan
*
Author to whom correspondence should be addressed.
Received: 31 July 2018 / Revised: 16 August 2018 / Accepted: 28 August 2018 / Published: 6 September 2018
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Abstract

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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