Systematic optimization of low bandgap polymer/[6,6]-phenyl C70 butyric acid methyl ester blend photodiode via structural engineering |
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| Affiliation: | 1. School of Chemical Engineering and Material Science, Chung-Ang University, Seoul 156-756, South Korea;2. Energy Nano Materials Research Center, Korea Electronics Technology Institute (KETI), Seongnam 463-816, South Korea;1. College of Physics and Electronic Engineering, Hengyang Normal University, Hengyang 421002, People’s Republic of China;2. Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, People’s Republic of China;3. School of Physics and Electronics, Central South University, Changsha 410083, People’s Republic of China;1. Department of Chemistry and RINS, Gyeongsang National University, Jinju 660-701 South Korea;2. Department of Materials Engineering and Convergence Technology and ERI, Gyeongsang National University, Jinju 660-701, South Korea;3. Department of Energy Systems Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, South Korea;1. College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, China;2. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 10090, China;3. State Key Laboratory for Mechanical Behavior of Materials, Xi''an Jiaotong University, Xi''an, 710049, China;1. School of Chemical Engineering and Materials Science, Integrative Research Center for Two-dimensional Functional Materials, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea;2. Department of Energy Science & Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, 42988, Republic of Korea;1. POSTECH Organic Electronics Laboratory, Polymer Research Institute, Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea;2. School of Chemical Engineering and Materials Science, Chung-Ang University, Seoul 156-756, Republic of Korea;3. Department of Nano, Medical and Polymer Materials, Yeungnam University, Gyeongsan 712-749, Republic of Korea |
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| Abstract: | Synthetic approaches for optimizing polymer-based organic photodiodes (OPDs) by systematically analyzing the effects of the hole-blocking layer, the electron-blocking layer, and the thickness and morphology of the active layer with respect to the dark current and detectivity have been reported. PBDTT-DPP with a repeating alkylthienylbenzodithiophene (BDTT) and diketopyrrolopyrrole (DPP) units is used as a p-type polymer for achieving both broadband absorption and a high absorption coefficient in conjunction with n-type [6,6]-phenyl C70 butyric acid methyl ester (PC70BM) for constructing photoactive layers. Through systematic investigations of various interfacial layers, we found that the thickness of the active layer and the energy level of the hole/electron blocking layer were critical for minimizing the dark current of OPDs. By changing the deposition method of the PBDTT-DPP/PC70BM blend and using post treatment, we discovered that the morphology of the active layer was directly related to the photocurrent of OPDs. Furthermore, we conducted a comparative study between a bulk heterojunction and a planar heterojunction (PHJ) to demonstrate the effectiveness of the PHJ for suppressing the dark current. Consequently, we realized a high detectivity of 5.3 × 1012 Jones with an optimized device architecture and morphology. This work shows the importance of a synthetic approach for optimizing OPDs that requires both a high photocurrent and a low dark current in the reverse saturation regime. |
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| Keywords: | Organic photodiodes Blocking layer Solvent additive Bulk heterojunction Organic semiconductor |
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