Organic phototransistors with nanoscale phase-separated polymer/polymer bulk heterojunction layers

Hyemin Hwang, Hwajeong Kim, Sungho Nam, Donal D.C. Bradley, Chang Sik Ha, Youngkyoo Kim

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Low-cost detectors for sensing photons at a low light intensity are of crucial importance in modern science. Phototransistors can deliver better signals of low-intensity light by electrical amplification, but conventional inorganic phototransistors have a limitation owing to their high temperature processes in vacuum. In this work, we demonstrate organic phototransistors with polymer/polymer bulk heterojunction blend films (mixtures of p-type and n-type semiconducting polymers), which can be fabricated by inexpensive solution processes at room temperature. The key idea here is to effectively exploit hole charges (from p-type polymer) as major signaling carriers by employing p-type transistor geometry, while the n-type polymer helps efficient charge separation from excitons generated by incoming photons. Results showed that the present organic transistors exhibited proper functions as p-type phototransistors with ∼4.3 A W-1 responsivity at a low light intensity (1 W cm -2), which supports their encouraging potential to replace conventional cooled charge coupled devices (CCD) for low-intensity light detection applications. © 2011 The Royal Society of Chemistry.
Original languageEnglish (US)
JournalNanoscale
Volume3
Issue number5
DOIs
StatePublished - May 1 2011
Externally publishedYes

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