• GUILIN LIU

      Articles written in Bulletin of Materials Science

    • Study on the improvement of p-type multi-crystalline silicon material for solar cells by the hydrogenation with electron injection

      SHAOMIN LI JIANBO SHAO XI XI GUILIN LIU RUOYING PENG RULONG CHEN LIPING CHEN YANFENG JIANG XIAOFENG GU

      More Details Abstract Fulltext PDF

      In this paper, we have found that the efficiency of p-type mono-crystalline silicon (mono-Si) passivated emitter and rear contact (PERC) solar cells can be increased by 0.12%abs. with the process of hydrogenation with electron injection(HEI). However, the same scheme was not suitable for p-type multi-crystalline silicon (mc-Si) solar cells. To promote power conversion efficiency (PCE) for the mc-Si solar cells, we have explored a developed HEI process for the mc-Si solar cells to improve the device performance. Meanwhile, we also analysed the mechanization inside the solar cells after applying the HEI process. Through the design of experiment (DOE), the correlation among injection current, temperature, injection time and efficiency improvement was analysed in detail. It was proved that mc-Si solar cells require higher current injection andtemperature to passivate the complex impurities in the bulk, when compared to mono-Si solar cells.With the optimal scheme explored by this paper, the open circuit voltage (Uoc), short circuit current density (Jsc) and fill factor (FF) of p-type mc-Si solar cells, respectively, increased by 1.2 mV, 0.11 mA cm$^{−2}$ and 0.05% abs., respectively. The efficiency was improved about $0.11\pm 0.005$% abs.. These results will provide a certain method and basis for further improving the efficiency of mc-Si PERC cells and overcoming the light-elevated temperature-induced degradation by HEI process.

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

      JIANBO SHAO XI XI GUILIN LIU SHAOMIN LI RUOYING PENG GUOQING CHEN YONGFEI JIANG

      More Details Abstract Fulltext PDF

      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 performedto investigate the improvement of large area (>240 cm$^2$) 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, theresults indicated that the parameters, such as open-circuit voltage ($U_{\rm oc}$) and short-circuit current density ($J_{\rm sc}$) 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 $\sim$0.190 $\pm$ 0.005%$_{\rm abs.}$ for 2 min, which was higher than that without pre-LID (0.115 $±$ 0.005%$_{\rm abs.}$). Moreover, the results showed that the efficiency of large area mono-Si PERC solar cells with light-induceddegradation (LID) treatment after LED hydrogenation only existed a slight degradation of about $-$0.253 $\pm$ 0.005%$_{\rm rel.}$. Compared with mono-Si PERC solar cells without pre-LID, the efficiency improvement and LIDmitigation 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.

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.