Improving the efficiency of CH3NH3PbI3 based photovoltaics by tuning the work function of the PEDOT: PSS hole transport layer

Sheng Hsiung Chang, Kuen Feng Lin, Kuo Yuan Chiu, Chia Lung Tsai, Hsin Ming Cheng, Shih Chieh Yeh, Wen Ti Wu, Wei Nien Chen, Chin Ti Chen, Sheng Hui Chen, Chun Guey Wu

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

The open-circuit voltage of CH3NH3PbI3 based photovoltaics was enhanced from 0.77 V to 0.9V, which resulted in an improvement of the average power conversion efficiency from 5.63% to 11.74% achieved by tuning the work function of the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hole transport layer. The higher work function of the PEDOT:PSS (1:20wt%) thin film, as compared to the PEDOT:PSS (1:6wt%) and PEDOT:PSS (1:2.5wt%) thin films, was observed using photoelectron spectrometer. The carrier density of PEDOT was obtained by analyzing the transmittance spectrum of PEDOT:PSS/glass with the transfer matrix method. The Drude model can be used to explain the increased work function of the PEDOT:PSS thin film obtained by decreasing the ratio of PEDOT to PSS. The increased carrier density of the PEDOT in PEDOT:PSS thin films originated from conformational changes in the PEDOT chains as confirmed by Raman scattering spectroscopy.

Original languageEnglish
Pages (from-to)892-899
Number of pages8
JournalSolar Energy
Volume122
DOIs
StatePublished - 1 Dec 2015

Keywords

  • Organometal halide perovskite
  • PEDOT:PSS
  • Photovoltaics

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