Dithienopyrrole-benzodithiophene based donor materials for small molecular BHJSCs: Impact of side chain and annealing treatment on their photovoltaic properties |
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| Affiliation: | 1. Crop Protection Chemicals Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India;2. Inorganic & Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India;3. Department of Physics, The LNM Institute of Information Technology, Jamdoli, Jaipur, India;4. AcSIR, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India;1. Crop Protection Chemicals Division, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500 007, India;2. Biomaterials Division, CSIR-Central Leather Research Institute, Adyar, Chennai 600 020, India;3. Department of Organic Chemistry, Adikavi Nannaya University, Rajahmundry, 533105, India;1. School of Advanced Materials, Peking University Shenzhen Graduate School, Peking University, Shenzhen, 518055, PR China;2. Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen, 518055, PR China;3. Materials Science Division, Argonne National Laboratory, 9700 Cass Avenue, Lemont, IL, 60439, United States;4. Institute for Molecular Engineering, The University of Chicago, 5640 South Ellis Avenue, Chicago, IL, 60637, United States;1. College of Chemistry, Nanchang University, Nanchang 330031, China;2. Institute of Polymers and Energy Chemistry (IPEC), Nanchang University, Nanchang 330031, China;1. Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Uppal road, Tarnaka, Hyderabad 500007, India;2. R & D Center for Engineering and Science, JEC group of Colleges, Jaipur Engineering College, Kukas, Jaipur 303101, India;1. Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China;2. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | Two small molecular organic materials denoted as ICT1 and ICT2 with A-D1-D2-D1-A architecture have been synthesized and their thermal, photo-physical, electrochemical and photovoltaic properties are explored. Synthesized materials have n-butylrhodanine acceptor (A), dithienopyrrole (DTP) (D1) and benzodithiophene (BDT) (D2) (Alkoxy BDT and alkylthiophene BDT, respectively for ICT1 and ICT2) donor moieties. Both the materials have good solubility (up to 25 mg/mL) in most common organic solvents and have excellent thermal stability with the decomposition temperature (Td) as 348 and 382 °C, respectively for ICT1 and ICT2. Both ICT1 and ICT2 have broad and intense visible region absorption (molar excitation coefficient is 1.71 × 105 and 1.65 × 105 mol−1 cm−1, respectively for ICT1 and ICT2) and have suitable HOMO and LUMO energy levels for PC71BM acceptor. Bulk heterojunction solar cells with ITO/PEDOT:PSS/blend/Al structure are fabricated using these materials. The BHJSCs fabricated by spin cast of ICT1:PC71BM and ICT2:PC71BM (1:2 wt ratio) blend from chloroform showed power conversion efficiency (PCE) of 2.77% (Jsc = 6.84 mA/cm2, Voc = 0.92 V and FF = 0.44) and 3.27% (Jsc = 7.26 mA/cm2, Voc = 0.96 V and FF = 0.47), respectively. Annealing the active layer significantly improved the PCE of these BHJSCs to 5.12% (Jsc = 10.15 mA/cm2, Voc = 0.87 V and FF = 0.58) and 5.90% (Jsc = 10.68 mA/cm2, Voc = 0.92 V and FF = 0.60), respectively for ICT1 and ICT2 donors. The enhancement in the PCE is due to higher light harvesting ability of the active layer, better nanoscale morphology for efficient and balanced charge transport and effective exciton dissociation at the donor-acceptor interface. |
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| Keywords: | Organic BHJSCs Dithienopyrrole Benzodithiophene Side chain engineering Annealing treatment |
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