13% Efficiency hybrid organic/silicon-nanowire heterojunction solar cell via interface engineering

Pei-Chen Yu*, Chia Ying Tsai, Jan Kai Chang, Chih Chung Lai, Po Han Chen, Yi Chun Lai, Pei Ting Tsai, Ming Chin Li, Huai Te Pan, Yang Yue Huang, Chih I. Wu, Yu Lun Chueh, Shih Wei Chen, Chen Hsun Du, Sheng Fu Horng, Hsin-Fei Meng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

171 Scopus citations

Abstract

Interface carrier recombination currently hinders the performance of hybrid organic-silicon heterojunction solar cells for high-efficiency low-cost photovoltaics. Here, we introduce an intermediate 1,1-bis[(di-4-tolylamino) phenyl]cyclohexane (TAPC) layer into hybrid heterojunction solar cells based on silicon nanowires (SiNWs) and conjugate polymer poly(3,4-ethylenedioxy- thiophene):poly(styrenesulfonate) (PEDOT:PSS). The highest power conversion efficiency reaches a record 13.01%, which is largely ascribed to the modified organic surface morphology and suppressed saturation current that boost the open-circuit voltage and fill factor. We show that the insertion of TAPC increases the minority carrier lifetime because of an energy offset at the heterojunction interface. Furthermore, X-ray photoemission spectroscopy reveals that TAPC can effectively block the strong oxidation reaction occurring between PEDOT:PSS and silicon, which improves the device characteristics and assurances for reliability. These learnings point toward future directions for versatile interface engineering techniques for the attainment of highly efficient hybrid photovoltaics.

Original languageEnglish
Pages (from-to)10780-10787
Number of pages8
JournalACS Nano
Volume7
Issue number12
DOIs
StatePublished - 23 Dec 2013

Keywords

  • conductive polymer
  • hybrid solar cell
  • interface engineering
  • small molecule

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