Effect of spatial distribution of generation rate on bulk heterojunction organic solar cell performance: A novel semi-analytical approach |
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| Affiliation: | 1. Department of Electrical and Electronic Engineering, Bangladesh University of Engineering and Technology, Dhaka, 1205, Bangladesh;2. Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, BC, V6T1Z4, Canada;1. Department of Energy and Materials Engineering, Dongguk University, 26 Pil-dong, 3-ga, Jung-gu, Seoul, 100-715, Republic of Korea;2. Department of Nanobio Materials and Electronics, School of Materials Science and Engineering, Heeger Center for Advanced Materials, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Buk-gu, Gwangju, 500-712, Republic of Korea;1. Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA;2. Department of Chemistry, University of Wisconsin-Madison, Madison, WI 53706, USA;1. Dipartimento di Fisica e Geologia, Università degli Studi di Perugia, via A.Pascoli 6, 06123,Perugia, Italy;2. Dipartimento di Chimica, Biologia e Biotecnologia, Università degli Studi di Perugia, via Elce di Sotto 8, 06123 Perugia, Italy;1. School of Energy Science and Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin 150001, PR China;2. School of New Energy, Harbin Institute of Technology at Weihai, 2, West Wenhua Road, Weihai, 264209, PR China |
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| Abstract: | We present a physics-based semi-analytical model of bulk heterojunction (BHJ) organic solar cell (OSC) for predicting the electrical characteristics of the device, taking into account the space dependency of generation rate profiles. The model enables us to derive the J-V characteristics of BHJ OSC without the need of a closed form expression of arbitrary carrier generation rate (which may not exist), hence avoiding the cumbersome numerical fitting method employed in literature previously. Using the proposed model, we perform an extensive analysis to study the effect of spatial distribution of generation rate profiles on the device performance. For this purpose, we use Gaussian shaped profiles that have a common average value thus retaining the total number of generated carriers same. We vary the position of the generation peak and its sharpness (width of the Gaussian peak) as well as number of peaks to analyze their effects on device efficiency. For the considered profiles, results show that the optimized profile has a peak carrier generation rate exactly halfway through the active layer and falls off sharply on either side. In the end, we propose methods of controlling the generation profiles by modifying the device structure and perform optical simulation to show the corresponding generation profiles. Thus, we show the usefulness of our derived model in finding the spatial distribution of a given number of carriers along the active layer that yields the best device performance. |
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| Keywords: | Organic solar cell Bulk heterojunction Current-voltage characteristics Spatial carrier generation Semi-analytical model |
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