Impurity mechanism of monocrystalline silicon PERC solar cells stimulated by prelight-induced degradation

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Bull Mater Sci (2020)43:262 https://doi.org/10.1007/s12034-020-02239-8

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Impurity mechanism of monocrystalline silicon PERC solar cells stimulated by prelight-induced degradation JIANBO SHAO1,2, XI XI2,3,* , GUILIN LIU2,3, SHAOMIN LI1,2, RUOYING PENG2,3, GUOQING CHEN2,3 and YONGFEI JIANG4 1

School of Internet of Things, Jiangnan University, Wuxi 214122, China Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Wuxi 214122, China 3 School of Science, Jiangnan University, Wuxi 214122, China 4 Wuxi Suntech Power Co., Ltd., Wuxi 214208, China *Author for correspondence ([email protected]) 2

MS received 26 February 2020; accepted 8 April 2020 Abstract. Although the monocrystalline silicon (mono-Si)-passivated emitter and rear contact (PERC) solar cells have achieved incredible efficiency, they still can be further improved by hydrogenation. So the hydrogenation was performed to investigate the improvement of large area ([240 cm2) mono-Si PERC solar cells and estimate the significance of previous light-induced degradation (pre-LID) under a high-intensity infrared (HI-IR) LEDs source platform. Then, the results indicated that the parameters, such as open-circuit voltage (Uoc) and short-circuit current density (Jsc) and fill factor (FF), could be better improved after LED hydrogenation with the execution of the pre-LID. The efficiency of mono-Si PERC solar cells with pre-LID increased by *0.190 ± 0.005%abs. for 2 min, which was higher than that without pre-LID (0.115 ± 0.005%abs.). Moreover, the results showed that the efficiency of large area mono-Si PERC solar cells with lightinduced degradation (LID) treatment after LED hydrogenation only existed a slight degradation of about -0.253 ± 0.005%rel.. Compared with mono-Si PERC solar cells without pre-LID, the efficiency improvement and LID mitigation of mono-Si solar cells with pre-LID was faster and more significant by LED hydrogenation, so that the LED hydrogenation time significantly can shorten from 6 to 2 min. Additionally, the possible presence of a boron-oxygen (BO) model was estimated, and this BO model is susceptible to be activated by the injection of external energy, resulting in more BO defects in the process of pre-LID, so that subsequent hydrogenation rate becomes faster. Keywords. model.

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Hydrogenation; previous light-induced degradation; monocrystalline silicon solar cells; boron-oxygen

Introduction

The light-induced degradation (LID) in boron-doped Czochralski (Cz) silicon solar cells has caused significant attention in both academic circles and the photovoltaic industry for decades, especially on those utilizing the higher efficiency passivated emitter and rear contact (PERC) cell technology [1–4]. Numerous studies have undertaken detailed defect analysis studies and defect formation and recovery kinetics to identify a possible root cause [4,5]. For boron-doped and oxygen-rich silicon cells, the carrier lifetime would be limited by a recombinatio