Size-dependent polymer/CuInS2 solar cells with tunable synthesis of CuInS2 quantum dots |
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| Affiliation: | 1. Department of Physics, Christian College, Angadikal P.O., Chengannur, Kerala 689122, India;2. UGC–DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452017, India;1. Physics Department, Faculty of Science, Assiut University, Assiut 71516, Egypt;2. Materials Science Laboratory, Physics Department, Girls College for Arts, Science, and Education, Ain Shams University, Cairo, Egypt;1. LEM Laboratory, Jijel University, B.P. 98, Ouled Aissa, Jijel 18000, Algeria;2. Department of Electronic, Jijel University, B.P. 98, Ouled Aissa, Jijel 18000, Algeria;1. Research Platform of Nanosciences and Nanotechnologies, Pierre Gemayel Campus, Lebanese University, Fanar 90239, Lebanon;2. LPA (Laboratoire de Physique Appliquée), Faculty of Sciences 2, Pierre Gemayel Campus, Lebanese University, Fanar 90656, Lebanon;3. Ecole Supérieure d’Ingénieurs de Beyrouth, Campus des Sciences et Technologies, Université Saint Joseph, Mar Roukoz, Lebanon;1. Advance Photonics Science Institute, Faculty Science, Universiti Teknologi Malaysia, Skudai 81310, Malaysia;2. Physics Department, College of Science, Wasit University, Al-Kut 52001, Iraq;1. Laboratoire de Photovoltaïque et Matériaux Semi-conducteurs – ENIT – Université Tunis ElManar, BP 37, Le belvédère 1002 Tunis, Tunisie;2. Institut Préparatoire des Etudes d׳Ingénieurs El Manar – Université de Tunis El Manar, BP 37, le belvédère 1002 Tunis, Tunisie |
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| Abstract: | This paper reports the size-dependent performance in polymer/CuInS2 solar cells with tunable synthesis of chalcopyrite CuInS2 quantum dots (QDs) by the solvothermal method. The CuInS2 QDs of 3.2–5.4 nm in size are fine tuned by the reaction time in the solvothermal process with the slow supply of In3+ ions during the crystallization, and the band gaps increased with QDs sizes decreasing according to the results from the characterization of sizes, morphologies, component elements, valence states and band gaps of CuInS2 QDs. We fabricated MEH-PPV/CuInS2 solar cells, and the photoactive layer of device displayed size-dependent light-harvesting, charge separation and transport ability. Moreover, the solar cells exhibit size-dependent short circuit current (Jsc) and open circuit voltage (Voc), with higher performance in both Jsc and Voc for smaller CuInS2 QDs, resulting in the maximum power conversion efficiency of ca. 0.12% under the monochromic illumination at 470 nm; CuInS2 QDs actually serve as an effective electron acceptor material for the MEH-PPV/CuInS2 solar cells with the wide spectral response extending from 300 to 900 nm. |
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| Keywords: | Quantum dots Solvothermal process Solar cells Charge transfer |
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