Thickness effects of thermally evaporated C60 thin films on regular-type CH3NH3PbI3 based solar cells

Kun Mu Lee, Cheng Chiang Chen, Lung Chien Chen, Sheng Hsiung Chang, Kai Shiang Chen, Shih Chieh Yeh, Chin Ti Chen, Chun Guey Wu

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Comprehensive studies were carried out to explore the thickness-dependent characteristics of thermally evaporated C60 thin films. The structural, optical, electronic and surface properties of the resultant C60 thin films were analyzed using Raman scattering spectrometry, photoluminescence spectroscopy, absorbance spectroscopy, photoelectron emission spectrometry and water droplet contact angle measurement. The experimental results show that the thickness of the C60 thin film has a decisive impact on the photovoltaic performance of CH3NH3PbI3 based solar cells in terms of open-circuit voltage (VOC), short-circuit current density (JSC) and fill factor (FF). In the case of the 2.5 nm-thick C60 film, the solar cells have the better VOC and JSC, as the results of the lower electron affinity and higher transparency. The FF of the solar cell is related to the coverage of C60 on the transparent conductive electrode (TCE) and the CH3NH3PbI3 perovskite continuity. Consequently, the photovoltaic performance can be expected to be improved by using a smooth TCE.

Original languageEnglish
Pages (from-to)13-18
Number of pages6
JournalSolar Energy Materials and Solar Cells
Volume164
DOIs
StatePublished - 1 May 2017

Keywords

  • C thin film
  • CHNHPbI
  • Contact angle
  • Solar cell

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