Understanding the Optimization of the Emitter Coverage in BC-BJ Solar Cells

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Abstract

In this work, by exploiting two-dimensional (2-D) TCAD numerical simulations, we performed a study of optimum emitter coverage ratio (Ropt) to reach maximum performance on back contact-back junction (BC-BJ) solar cells. Ropt exhibits a strong dependence on pitch, emitter and back surface field (BSF) doping and bulk resistivity, ranging between 0.6 and 0.95. By fixing BSF doping, emitter doping and bulk resistivity, BSF and emitter width can be optimized independently one another. The optimum BSF width and the optimum emitter width are given by a trade-off between series resistance and electrical shading losses. From the design perspective, focusing on optimizing the BSF and emitter width is more effective than optimizing R at fixed pitch or BSF width.

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Procel, P., Guevara, M., Maccaronio, V., Guerra, N., Crupi, F., & Cocorullo, G. (2015). Understanding the Optimization of the Emitter Coverage in BC-BJ Solar Cells. In Energy Procedia (Vol. 77, pp. 149–152). Elsevier Ltd. https://doi.org/10.1016/j.egypro.2015.07.022

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