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Synergetic Effect of a Surfactant on the Facile Fabrication and High Detectivity of an Inverted Organic Bulk Heterojunction Photodiode
- Synergetic Effect of a Surfactant on the Facile Fabrication and High Detectivity of an Inverted Organic Bulk Heterojunction Photodiode
- Ha, Jea Uk; Kim, Kyoung Hwan; Yoon, Seong Won; Sim, Kyu Min; Cho, Jang Whan; Chung, Dae Sung
- DGIST Authors
- Chung, Dae Sung
- Issue Date
- ACS Photonics, 4(8), 2085-2090
- Article Type
- Butyric Acid; Cationic Surfactants; Cetyltrimethylammonium Bromide; Detectivity; Dyes; Fabrication; Fabrication Strategies; Heterojunctions; High Detectivity; Linear Dynamic Ranges; Low Dark Current; Organic Bulk Heterojunctions; Organic Photodiode; Organic Photodiodes; Photodiodes; Poly(3 Hexylthiophene); Surface Active Agents; Tin Oxides; Work Function; Work Function; Work Function Tuning; Work Function Tuning
- A new photodiode fabrication strategy for organic photodiodes is proposed, involving the use of a small amount of cationic surfactant in a blend solution aiming at synergetic effects of facile device fabrication and high performances. By adding a small amount of cationic surfactant (cetyltrimethylammonium bromide (CTAB)) to a blend solution consisting of poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PC60BM), the indium tin oxide (ITO) work function can be reduced to ∼4.55 eV due to the formation of a CTAB dipole layer, without the insertion of oxide buffer layers. Furthermore, we observe a meaningful contribution of the addition of CTAB to the morphology of the active layer in terms of the intermiscibility between P3HT and PC60BM. Various photophysical, morphological, and structural analyses provided strong evidence for the enhanced intermiscibility between P3HT and PC60BM. Owing to the synergetic contribution of CTAB, the resulting photodiode with inverted diode geometry reveals a high detectivity of ∼2.5 × 1012 Jones based on a low dark current of 1.3 × 10-8 A/cm2 at -1 V. In addition, a high -3 dB frequency of 4 kHz and a linear dynamic range of 100 dB are demonstrated. This work opens the possibility of facile and simple photodiode patterning/printing processes. © 2017 American Chemical Society.
- American Chemical Society
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