Designing a ternary photovoltaic cell for indoor light harvesting with a power conversion efficiency exceeding 20%

Hang Yin, Johnny Ka Wai Ho, Sin Hang CHEUNG, Roger Jie Yan, Ka Lok Chiu, Xiaotao Hao, Shu Kong SO*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

69 Citations (Scopus)

Abstract

We used several polymers as the ternary components to demonstrate a ternary strategy to improve the performance of PCDTBT:PC71BM devices under 1 sun and indoor illumination. With a binary bulk-heterojunction (BHJ) of PCDTBT:PC71BM organic photovoltaic (OPV) cell, a power conversion efficiency (PCE) of 16.5% under indoor light sources (300 lux from fluorescence tube) was achieved. However, with a ternary BHJ cell of PCDTBT:PDTSTPD:PC71BM, the PCE can be enhanced to 20.8%. FFs are the primarily improved in these devices. Transport and absorption measurements indicate the origins of the improvements of OPV performance: the ternary BHJ films exhibit enhanced hole mobilities and reduced Urbach energies, indicating that the blending of the PDTSTPD component passivates shallow traps near the band edges of the BHJ films.

Original languageEnglish
Pages (from-to)8579-8585
Number of pages7
JournalJournal of Materials Chemistry A
Volume6
Issue number18
DOIs
Publication statusPublished - 2018

Scopus Subject Areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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