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Control of the phase evolution of kesterite by tuning of the selenium partial pressure for solar cells with 13.8% certified efficiency
Nature Energy ( IF 49.7 ) Pub Date : 2023-04-13 , DOI: 10.1038/s41560-023-01251-6
Jiazheng Zhou , Xiao Xu , Huijue Wu , Jinlin Wang , Licheng Lou , Kang Yin , Yuancai Gong , Jiangjian Shi , Yanhong Luo , Dongmei Li , Hao Xin , Qingbo Meng

The control of the phase evolution during the selenization of kesterite Cu2ZnSn(S,Se)4 (CZTSSe) is crucial for efficient solar cells. Here, we regulate the phase-evolution kinetics of Ag-alloyed CZTSSe by applying a positive pressure in the reaction chamber at the initial stage of the annealing process. The partial pressure of Se decreases, reducing the collision probability between selenium molecules and the kesterite precursor during the initial formation of the crystals. This results in the precursor transforming into CZTSSe in a single step, without the formation of secondary phases. CZTSSe forms at relatively higher temperature than conventional methods, leading to high-crystallinity kesterite films with fewer defects. We demonstrate solar cells with a total area efficiency of 14.1% and a certified total area efficiency of 13.8%. This work provides insights into the selenization mechanism and phase evolution of kesterite absorbers, enabling efficient solar cells.



中文翻译:

通过调节太阳能电池的硒分压来控制锌黄锡矿的相变,认证效率为 13.8%

锌黄铜矿 Cu 2 ZnSn(S,Se) 4硒化过程中相演化的控制(CZTSSe) 对于高效太阳能电池至关重要。在这里,我们通过在退火过程的初始阶段在反应室中施加正压来调节 Ag ​​合金 CZTSSe 的相演化动力学。Se的分压降低,降低了硒分子与锌黄锡矿前体在晶体初始形成过程中的碰撞概率。这导致前体在单个步骤中转化为 CZTSSe,而没有形成第二相。CZTSSe 在比传统方法相对更高的温度下形成,导致高结晶度的锌黄锡矿薄膜具有更少的缺陷。我们展示的太阳能电池总面积效率为 14.1%,经认证的总面积效率为 13.8%。

更新日期:2023-04-14
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