TY - JOUR
T1 - Photocurrent Amplification in Bulk Heterojunction Organic Phototransistors with Different Donor–Acceptor Ratio
AU - Shidachi, Ren
AU - Matsuhisa, Naoji
AU - Zalar, Peter
AU - Chow, Philip C.Y.
AU - Jinno, Hiroaki
AU - Yokota, Tomoyuki
AU - Someya, Takao
N1 - Funding Information:
This work was financially supported by the JST ERATO Bio-Harmonized Electronics Project JPMJER1105. NM is supported by Advanced Leading Graduate Course for Photon Science (ALPS) and the Japan Society for the Promotion of Science (JSPS) research fellowship for young scientists. PCYC acknowledges the Japan Society for the Promotion of Science (JSPS) for a Postdoctoral Fellowship for Overseas Researchers. We thank Mari Koizumi at the University of Tokyo for the fruitful discussion on the fabrication process. We thank David D. Ordinario and Hanbit Jin for editing and proofreading our manuscript.
Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/6
Y1 - 2018/6
N2 - 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.
AB - 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.
KW - bulk heterojunction
KW - high responsivity
KW - organic phototransistors
KW - organic thin-film transistors
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U2 - 10.1002/pssr.201700400
DO - 10.1002/pssr.201700400
M3 - Letter
AN - SCOPUS:85045700985
SN - 1862-6254
VL - 12
JO - Physica Status Solidi - Rapid Research Letters
JF - Physica Status Solidi - Rapid Research Letters
IS - 6
M1 - 1700400
ER -