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

17 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 - Jan 1 2014

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donor materials
Heterojunctions
heterojunctions
Hole mobility
Conversion efficiency
optimization
hole mobility
Gene Conversion
Molecules
Ionization potential
Buffer layers
Energy gap
Cathodes
stems
ionization potentials
Copper
molecules
buffers
cathodes
broadband

All Science Journal Classification (ASJC) codes

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

Cite this

Comparison of small amounts of polycrystalline donor materials in C 70-based bulk heterojunction photovoltaics and optimization of dinaphthothienothiophene based photovoltaic. / Zheng, Yan Qiong; Potscavage, William J.; Zhang, Qi Sheng; Komino, Takeshi; Taneda, Masatsugu; Adachi, Chihaya.

In: Organic Electronics, Vol. 15, No. 4, 01.01.2014, p. 878-885.

Research output: Contribution to journalArticle

Zheng, Yan Qiong ; Potscavage, William J. ; Zhang, Qi Sheng ; Komino, Takeshi ; Taneda, Masatsugu ; Adachi, Chihaya. / Comparison of small amounts of polycrystalline donor materials in C 70-based bulk heterojunction photovoltaics and optimization of dinaphthothienothiophene based photovoltaic. In: Organic Electronics. 2014 ; Vol. 15, No. 4. pp. 878-885.
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