Improving the efficiency of inverted mixed-organic-cation perovskite absorber based photovoltaics by tailing the surface roughness of PEDOT: PSS thin film

Cheng Chiang Chen, Sheng Hsiung Chang, Lung Chien Chen, Feng Sheng Kao, Hsin Ming Cheng, Shih Chieh Yeh, Chin Ti Chen, Wen Ti Wu, Zong Liang Tseng, Chuan Lung Chuang, Chun Guey Wu

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

A phase-pure mixed-organic-cation perovskite absorber (MOC-PA) was fabricated by a one-step spin-coating process with a toluene washing treatment, and the structural, optical and excitonic properties of the resultant MOC-PAs were then characterized by scanning electron microscopy, X-ray diffractometry, absorbance spectrometer, and time-resolved photoluminescence. The averaged power conversion efficiency (PCE) of inverted phase-pure MOC-PA based photovoltaics could be improved from 12.21% to 13.28% by tailing the surface roughness of the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) thin film from 1.43 nm to 1.84 nm. The improved PCE is mainly due to the increased short-circuit current density (JSC) which is attributed to the improvement of the exciton dissociation, as confirmed by photoluminescence experiments. In addition, the experimental results indicate that the PCE can be further improved by increasing the crystallinity of MOC-PAs.

Original languageEnglish
Pages (from-to)445-451
Number of pages7
JournalSolar Energy
Volume134
DOIs
StatePublished - 1 Sep 2016

Keywords

  • Mixed-organic-cation perovskite absorbers
  • Nanosecond time-resolved photoluminescence
  • PEDOT:PSS thin films
  • Photovoltaics

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