Photoconductivity of composites based on CdSe quantum dots and low-band-gap polymers |
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| Affiliation: | 1. Laboratory of Nano-Bioengineering, National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 31 Kashirskoe sh., 115409 Moscow, Russian Federation;2. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 31 Leninsky pr., 119071 Moscow, Russian Federation;3. Laboratory of Research in Nanosciences-EA4682, Université de Reims Champagne-Ardenne, 51100 Reims, France;1. Department of Mathematics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;2. Department of Mathematics, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt;1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;2. Key Laboratory of Information Materials of Sichuan Province & School of Electrical and Information Engineering, Southwest University for Nationalities, Chengdu 610041, China;1. Department of Theoretical Physics, V. Lashkaryov Institute of Semiconductor Physics, NASU, Pr. Nauki 41, Kiev 03028, Ukraine;2. Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC 27695-7911, USA |
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| Abstract: | Photoconductivity of thin layers prepared by spin coating of blends of CdSe quantum dots (QDs) and a low-band-gap polymer PCDTBT or PTB7 has been studied. It has been found that photocurrent in the composites containing QDs of 10-nm in size is significantly higher than in those of containing 5-nm QDs. Analysis of the results showed that the photoresponse of the thin layers is mainly determined by the relative positions of the frontier energy levels of the materials used, organic semiconductors and QDs. Therefore, the ability to tune the relative positions of these levels by varying the QD size is of special importance, thus allowing the optimization of photodetectors and photovoltaic cells. |
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| Keywords: | Hybrid composite Heterostructure Nanoparticles Photoconductivity Quantum dots Low-band-gap polymer |
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