Numerical Simulation and Experimental Characterization of Emitter Wrap through Solar Cells with Deep Grooved Base Contact (EWT-DGB)

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• 作者：Massimo Nicolai<sup>asup><sup> ; sup><sup>massimo.nicolai3@unibo.it" class="auth_mail" title="E-mail the corresponding authorsup> ; Mauro Zanuccoli<sup>asup> ; Giovanni Paternoster<sup>bsup> ; Giuseppe de Ceglia<sup>bsup><sup> ; sup><sup>csup> ; Lorenza Ferrario<sup>bsup> ; Pierluigi Bellutti<sup>bsup> ; Enrico Sangiorgi<sup>asup> ; Claudio Fiegna<sup>asup>
• 关键词：Silicon solar cells ; Emitter Wrap Through (EWT) solar cells ; 3-D numerical simulations ; photovoltaic
• 刊名：Energy Procedia
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：92
• 期：Complete
• 页码：160-169
• 全文大小：930 K

文摘

In this work we present an Emitter Wrap Through cell with Deep Grooved Base contact (EWT-DGB), designed for both 1-sun and concentrating applications. The proposed approach, which consists in a deep grooved hole array composed by holes of two alternating doping type, allows both a reduction of the cell series resistance and an increase in collection efficiency also by using relatively thick substrates with low lifetime. The measured experimental data including dark J-V characteristics, figures of merit (FOMs) under illumination and external quantum efficiency (EQE) are compared to the results of 3-D drift-diffusion TCAD numerical simulations. Moreover, the impact of the hole spacing and of process-dependent physical parameters (interface defects) on FOMs is investigated by means of simulations.