Merocyanines for vacuum-deposited small-molecule organic solar cells |
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| Affiliation: | 1. Department of Chemistry, National Taiwan University, Taipei 106, Taiwan;2. Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung 202, Taiwan;3. Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan;4. Department of Electronic Engineering, Ming Chi University of Technology, New Taipei City 243, Taiwan;5. Institute of Atomic and Molecular Science, Academia Sinica, Taipei 106, Taiwan;1. School of Physics and Microelectronic and Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, Hunan University, Changsha 410082, China;2. Department of Electrical and Information Engineering, Hunan Institute of Engineering, Xiangtan 411101, China;1. Université de Pau et des Pays de l’Adour, IPREM (ECP, CNRS-UMR 5254), 2 Avenue Président Angot, 64053 Pau Cedex 09, France;2. Université de Pau et des Pays de l’Adour, IPREM (EPCP, CNRS-UMR 5254), 2 Avenue Président Angot, 64053 Pau Cedex 09, France;3. Université de Pau et des Pays de l’Adour, IPRA (CNRS-UMR 5142), Avenue de l’Université, BP 1155, 64013 Pau Cedex, France;4. CNRS, Institut de Chimie de Clermont – Ferrand (EP, ICCF, CNRS-UMR 6296), BP 80026, 63171 Aubière, France;5. CNRS, IPREM (EPCP, CNRS-UMR 5254), Hélioparc, 2 Avenue Président Angot, 64053 Pau Cedex 09, France;1. School of Electrical and Computer Engineering, University of Seoul, Seoul 02504, Republic of Korea;2. Division of Electronics and Electrical Engineering, Dongguk University, Seoul 04620, Republic of Korea;3. Research Institute for Natural Sciences, Hanyang University, Seoul 04763, Republic of Korea;4. Department of Advanced Convergence Technology, Research Institute of Advanced Convergence Technology, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si 15073, Republic of Korea;5. School of Electrical Engineering, Korea University, Seoul 02841, Republic of Korea;1. Fraunhofer Institute for Solar Energy Systems, Heidenhofstraße 2, 79110 Freiburg, Germany;2. Robert Bosch GmbH, Robert-Bosch-Platz 1, 70839 Gerlingen-Schillerhöhe, Germany;3. Freiburg Materials Research Center, Stefan-Meier-Straße 21, 79104 Freiburg, Germany;1. Center of Super-Diamond and Advanced Films (COSDAF), Department of Physics and Materials Science, City University of Hong Kong, Hong Kong Special Administrative Region;2. City University of Hong Kong Shenzhen Research Institute, Shenzhen, PR China |
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| Abstract: | We report here synthesis and photovoltaic properties of three merocyanines dyes (DPPT, DTPT, 1-NPPT) which are functionalized with electron withdrawing thiazolidenemalononitrile and electron rich diarylamine functionalities. It is found that structural feature of the diarylamino groups has a profound effect on the physical properties such as the absorption spectrum, oxidation potential, and HOMO/LUMO energy levels. The compound DTPT containing a better electron-donating ditolyl group, exhibits red-shifted absorption with relatively higher molar extinction coefficient, indicating its better light-harvesting ability. Hole mobility of these compounds is found to be strongly dependent on the various intermolecular interactions. Interestingly, single crystal structures reveal that the crystal packing motifs are rather closely related to the observed hole mobility in a trend of DPPT > DTPT > 1-NPPT. Vacuum-processed small-molecule organic solar cells were fabricated using the title merocyanines as p-type materials (donor) in combination with fullerene (C60 or C70) as n-type material (acceptor) with various device configurations. Among them, the DPPT-based devices outperform the devices based on DTPT and 1-NPPT. The power conversion efficiency (PCE) of DPPT-based device was improved from 1.55% of a BHJ device to 2.63% of a PMHJ device and 3.52% of a PMHJ device without the thin donor layer. |
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| Keywords: | Merocyanine Bulk heterojunction Planar-mixed heterojunction Small molecule organic solar cell Organic photovoltaic |
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