Photocurrent Amplification in Bulk Heterojunction Organic Phototransistors with Different Donor–Acceptor Ratio

Ren Shidachi, Naoji Matsuhisa, Peter Zalar, Philip C.Y. Chow, Hiroaki Jinno, Tomoyuki Yokota, Takao Someya

Research output: Contribution to journalLetterpeer-review

7 Citations (Scopus)


In this paper, the amplification of the photocurrent in organic phototransistors (OPTs) employing bulk heterojunctions (BHJs) with different donor–acceptor ratios has been studied. As a model system, poly[2-methoxy-5-(3’,7’-dimethyloctyloxy)-p-phenylene vinylene] (OC1C10-PPV) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) are used as donor and acceptor, respectively, combined with Al contact. It is found that for OPTs the mobility of the majority carrier is the dominating factor for maximizing the photocurrent. This is different from organic photodiodes (OPDs) where balanced hole and electron mobilities are important. For OPDs using the same model system, the maximum photocurrent is obtained for a PCBM content of 80 wt.% while for OPTs, it retained its photocurrent from PCBM 80 wt.% up to PCBM 100 wt.%. In addition, BHJ transistors respond more rapidly to changes in the illumination intensity than transistors with a pure PCBM layer.

Original languageEnglish
Article number1700400
JournalPhysica Status Solidi - Rapid Research Letters
Issue number6
Publication statusPublished - 2018 Jun
Externally publishedYes


  • bulk heterojunction
  • high responsivity
  • organic phototransistors
  • organic thin-film transistors

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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