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Issue 7, 2015
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Solution-processable all-small molecular bulk heterojunction films for stable organic photodetectors: near UV and visible light sensing

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Abstract

We report stable organic photodetectors with all-small molecular bulk heterojunction (BHJ) sensing layers prepared using solutions of electron-donating and electron-accepting small molecules. As an electron-donating molecule, 2,5-bis(2-ethylhexyl)-3,6-bis(4′-methyl-[2,2′-bithiophen]-5-yl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione (EHTPPD-MT) was synthesized via a Stille coupling reaction, whereas [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) was used as an electron-accepting component. The devices with the EHTPPD-MT:PC61BM BHJ layer could detect photons at a wavelength of 400–800 nm and exhibited a stable photoresponse under on/off modulation of near UV (405 nm) and visible (532 nm and 650 nm) light even at bias voltage conditions. The corrected responsivity reached ∼175 mA W−1 for the near UV detection at −1 V. An extremely durable photoresponse was measured for the present devices (including flexible devices) under illumination with high intensity green light (133.4 mW cm−2 at 532 nm) which is much stronger than standard sun light (100 mW cm−2, white). The excellent stability has been attributed to the tiny EHTPPD-MT crystals, which are formed in the EHTPPD-MT:PC61BM layers during the coating processes.

Graphical abstract: Solution-processable all-small molecular bulk heterojunction films for stable organic photodetectors: near UV and visible light sensing

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Supplementary files

Article information


Submitted
29 Sep 2014
Accepted
28 Nov 2014
First published
06 Jan 2015

J. Mater. Chem. C, 2015,3, 1513-1520
Article type
Paper
Author version available

Solution-processable all-small molecular bulk heterojunction films for stable organic photodetectors: near UV and visible light sensing

H. Lee, S. Nam, H. Kwon, S. Lee, J. Kim, W. Lee, C. Lee, J. Jeong, H. Kim, T. J. Shin and Y. Kim, J. Mater. Chem. C, 2015, 3, 1513
DOI: 10.1039/C4TC02194K

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