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首页> 外文会议>Physics, simulation, and photonic engineering of photovoltaic devices II >Modeling Cu_2ZnSnS_4 (CZTS) solar cells with kesterite and stannite phase variation
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Modeling Cu_2ZnSnS_4 (CZTS) solar cells with kesterite and stannite phase variation

机译：含钾钛矿和锡矿相变的Cu_2ZnSnS_4（CZTS）太阳能电池建模

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摘要

Cu_2ZnSnS_4 (CZTS) may exhibit both kesterite and stannite polymorphs and shows promise as an absorber layer in thin film photovoltaic solar cells to be produced at terawatt scales. This study examines the effects of CZTS polymorphism and inhomogeneous distributions of CZTS polymorphs on device characteristics under scenarios of single phase films, a sinusoidal variation between kesterite and stannite with depth, and single phase films with thin layers of the other polymorph at both interfaces. In general, stannite-only devices are predicted to have higher efficiency than kesterite-only devices and sinusoidal grading results in efficiency between those of the pure phases. However, the device performance is relatively insensitive to the wavelength of the sinusoidal grading and rather is very sensitive to the phase present at the CdS interface. Predicted AM1.5 current-voltage (J-V) curves and descriptive metrics as well as wavelength-resolved quantum efficiencies are reported for all models. Based on these results, we propose control of cation ordering in CZTSSe as a mechanism for device design using bandgap grading and interface engineering without variation of stoichiometry.
机译：Cu_2ZnSnS_4（CZTS）可能同时表现出Kesterite和Stanite多晶型物，并有望作为太瓦规模生产的薄膜光伏太阳能电池中的吸收层。这项研究研究了在单相膜，红景天和锡矿之间深度的正弦变化以及两个界面上具有其他多晶型物薄层的单相膜的情况下，CZTS多态性和CZTS多晶型物的不均匀分布对器件特性的影响。通常，仅锡矿设备的效率要比仅硅藻土设备的效率高，正弦分级会导致纯相之间的效率提高。但是，设备性能对正弦渐变的波长相对不敏感，而对CdS界面上存在的相位非常敏感。报告了所有模型的预测AM1.5电流-电压（J-V）曲线和描述性指标以及波长分辨的量子效率。基于这些结果，我们建议控制CZTSSe中的阳离子有序化，作为使用带隙分级和界面工程进行设备设计的机制，而无需改变化学计量。

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