Ambipolar organic phototransistors based on 6,6′-dibromoindigo

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RSC Advances, ISSN: 2046-2069, Vol: 8, Issue: 27, Page: 14747-14752

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Kim, Hyoeun; Kim, Gyoungsik; Song, Inho; Lee, Jungho; Abdullah, Hanum; Yang, Changduk; Oh, Joon Hak
Royal Society of Chemistry (RSC); ROYAL SOC CHEMISTRY; The Royal Society of Chemistry
Chemistry; Chemical Engineering
article description
Ambipolar organic phototransistors were fabricated using a natural pigment 6,6′-dibromoindigo (6-BrIG) as the active channel. These phototransistors yielded significantly enhanced currents upon light illumination with photoresponsivities and external quantum efficiencies as high as 10.3 A W and 2437% for the n-channel, and 55.4 mA W and 13.1% for the p-channel, respectively. In addition, simple inverter complementary circuits were fabricated by integrating two ambipolar phototransistors. Channel current was dependent on light intensity and voltage bias. This study provides a basis for an in-depth understanding of the optoelectronic characteristics of 6-BrIG, and introduces this material as an ecofriendly candidate for optoelectronic applications.