Comparison of small amounts of polycrystalline donor materials in C 70-based bulk heterojunction photovoltaics and optimization of dinaphthothienothiophene based photovoltaic

Yan Qiong Zheng, William J. Potscavage, Qi Sheng Zhang, Takeshi Komino, Masatsugu Taneda, Chihaya Adachi

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Comparative studies of the effects of a series of polycrystalline donors on the performance of 95 wt.%-C70-based bulk-heterojunction (BHJ) photovoltaics were conducted. A BHJ based on the wide band-gap molecule dinaphthothienothiophene (DNTT) shows power conversion efficiency (ηPCE) of up to 4.28%. The photovoltaic parameters are superior to those of devices using the similar molecule pentacene (PEN) or polycrystalline copper phthalocyanine (CuPc) for donor concentrations from 5 to 30 wt.%. The low-lying DNTT ionization potential and the high μh in the DNTT blend support the excellent DNTT device performance. The low performance of BHJs with 5 wt.% PEN and 5 wt.% CuPc may stem from strong exciplex recombination in the PEN:C70 blend and limited hole mobility combined with geminate polaron-pair recombination in the CuPc:C70 blend. The zero-field hole mobility of the blends with 5 wt.% donor has a positive correlation with the corresponding device performance. The ηPCE of a 5 wt.%-DNTT BHJ cell was improved to 4.92% by optimizing the cathode buffer layer.

Original languageEnglish
Pages (from-to)878-885
Number of pages8
JournalOrganic Electronics
Volume15
Issue number4
DOIs
Publication statusPublished - Apr 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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