High flexible Cu2ZnSn(S,Se)4 solar cells by green solution-process
High flexible Cu2ZnSn(S,Se)4 solar cells by green solution-process
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采用绿色溶液工艺的高柔性 Cu2ZnSn(S,Se)4 太阳能电池
DOI：
10.1016/j.solener.2018.11.030
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发表时间：
2019-01-01
期刊：
影响因子：
6.7
通讯作者：
Wu, Sixin
中科院分区：
文献类型：
--
作者：
Yan, Qiong;Cheng, Shuying;Wu, Sixin
无论是刚性的还是柔性的Cu2ZnSn(S，Se)(4)(CZTSSe)太阳电池的最高效率都远远低于理论值。这主要是由于吸收层中的能带拖尾和吸收层/Mo界面附近的大量复合阻碍了载流子的传输，导致了VOC和Ff的退化，这在柔性太阳能电池中最为明显。本文采用绿色溶液法制备了柔性钼衬底上的CZTSSe薄膜，并对其进行了硒处理。通过优化加硒条件(加硒时间和温度)，在550℃下保温12min，获得了致密、结晶良好、无微裂纹的CZTSSe薄膜。当VOC和FF分别提高到390.43 mV和57.71%时，效率最高可达6.78%。理想因子A、串联电阻R-S、失配增量(Eg-PL)和势能涨落伽马的显著降低表明，能带拖尾和复合明显减少。首次研究了CZTSSe太阳电池性能随弯曲半径和周期的变化规律。结果表明，在可重复的释放-拉伸循环中，该药物具有长期稳定性。具有高拉伸能力的柔性CZTSSe太阳能电池为柔性太阳能电池的发展提供了启示。
The highest efficiencies for both rigid and flexible Cu2ZnSn(S,Se)(4 )(CZTSSe) solar cells are still far behind the theoretical values. This is mainly due to band tailing in absorber and a large recombination near absorber/Mo interface that block the carrier transportation and lead to Voc and FF degradation, which are mostly noticeable in flexible solar cells. In this paper, CZTSSe thin films were prepared on flexible Mo substrates by green solutionbased method followed by selenization. By optimizing selenization conditions (selenization time and temperature), dense and well crystallized CZTSSe thin films without micro-cracks were obtained at 550 degrees C for 12 min. The best efficiency of 6.78% can be achieved with Voc and FF enhanced to 390.43 mV and 57.71%. The dramatic reductions in ideal factor A, series resistance R-s, the mismatch Delta(Eg-PL) and potential fluctuation gamma indicate that band tailing and recombination are significantly reduced. The performance degradation with bending radius and cycles is studied for the first time among CZTSSe solar cells. Results indicate long-term stability at repeatable release-stretch cycles. The flexible CZTSSe solar cells with high stretch ability shed light on the development of flexible solar cells.