效率超过19%的CdTe薄膜太阳电池

从电池结构、关键制备技术与流程、功能层材料与器件性能方面详细阐述了本研究组在高效率宽光谱CdTe薄膜太阳电池方向的研究工作。提出了新的扩散预制层制备工艺,拓展梯度带隙吸收层制备和组分调控工艺窗口;协同调控梯度吸收层预制结构与Se扩散相关的吸收层制备热过程和活化热过程,优化梯度吸收层组分分布和能带结构;解决前电极窗口层与传统制备技术的兼容性问题,消除限制转换效率的前界面势垒;制备得到两种主流结构的CdTeSe薄膜太阳电池,获得19.1%的器件光电转换效率。

CdTe Thin Film Solar Cells with Efficiency Exceeding 19%

In this paper, the critical issues related to efficient wide-spectrum CdTe thin film solar cells were studied, including device structure, preparation process, functional layers and device performance. A new preparation process of diffusional precursor was proposed to regulate the absorber component. The absorber structure and the Se diffusion related thermo process and activation process were developed to realize a synergistic modification of composition distribution and band structure. The incompatibility between window layer and traditional preparation process was resolved, and the barrier at the front interface was eliminated. Two kinds of CdTeSe based thin film solar cells were fabricated and an efficiency as high as 19.1% was obtained.