Effects of thin film processing on pentacene/C60 bilayer solar cell performance |
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| Affiliation: | 1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, Shandong, China;2. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;1. Malaviya National Institute of Technology Jaipur, JLN Marg, Jaipur 302017, Rajasthan, India;2. Amity University, Sector 125, Noida, U.P., India;1. Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan;2. PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan;3. Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Meguro, Tokyo 153-8902, Japan;1. Hunan Key Laboratory for Super-Microstructure and Ultrafast Process, College of Physics and Electronics, Central South University, Changsha 410083, PR China;2. Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA;1. Nano-Science & Semiconductor Labs., Physics Department, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt;2. Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Saudi Arabia;3. Physics Department, Faculty of Science, Menoufia University, Shebin El-Koom, Egypt;4. Department of Physics, Faculty of Science and Arts, Firat University, Elazi?, Turkey;1. Research Center for Photoenergy Harvesting & Conversion Technology (phct), Division of Electronics and Electrical Engineering, Dongguk University, Seoul 04620, Republic of Korea;2. Department of Chemistry, Korea University, Seoul 02841, Republic of Korea;3. School of Electronics Engineering, Kyungpook National University, Daegu 41566, Republic of Korea;4. Research Center for Photoenergy Harvesting & Conversion Technology (phct), Department of Energy & Materials Engineering, Dongguk University, Seoul 04620, Republic of Korea;5. Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea;6. Department of Electrical Engineering, Engineering Research Institute (ERI), Gyeongsang National University, Jinju 52828, Republic of Korea |
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| Abstract: | Solar cells based on pentacene/C60 bilayer heterojunctions have been fabricated with a structure of ITO/poly(styrenesulfonate) (PEDOT:PSS)/pentacene (40 nm)/fullerene (C60)(40 nm)/2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) (10 nm)/Al. The effect of pentacene crystalline domain size on performance was investigated by controlling the pentacene deposition rate. The devices show improved light-to-electricity conversion efficiencies from 0.49% to 1.12% under an AM 1.5 solar simulator (100 mW/cm2), when the pentacene evaporation rate is in a range of 5 Å/s–0.5 Å/s. Atomic force microscopy (AFM) measurements show that the pentacene films deposited by a slow evaporation rate have larger crystalline domains and a fewer amorphous domains, compared to films obtained by faster evaporation rates. Upon thermal annealing at 200 °C for 1 min, there is merging of pentacene crystalline domains. These changes in film morphology impact the charge separation at the donor/acceptor interface and the hole and electron mobilities, and hence, directly affect the device performance. |
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