用于高性能光伏的热力学稳定的正方形薄膜
Boya Zhao1,2, Shi-Feng Jin3, Sheng Huang4
1National Research Center for Molecular Sciences, Key Laboratory of Molecular Nanostructure and Nanotechnology , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , P. R. China.
Journal of the American Chemical Society
|August 29, 2018
概括
研究人员为光伏发电开发了稳定,高效的正方体 γ-CsPbI3薄膜. 这一突破克服了传统化矿的不稳定性,使得太阳能电池的性能强大.
科学领域:
- 材料科学
- 固态化学
- 太阳能发电
背景情况:
- 与有机无机对应物相比,全无机化矿具有更高的热稳定性.
- 理想的立方α-CsPbI3阶段在室温下是不稳定的,转化为不理想的形 δ-CsPbI3阶段.
- α-CsPbI3的不稳定性阻碍了其在高效光伏中的应用.
研究的目的:
- 为高效光伏引入一种新型,热力学稳定的黑相薄膜.
- 在没有有机配体或混合/离子的情况下实现内在稳定性.
- 探索开发强大的无机矿太阳能电池的新途径.
主要方法:
- 通过使用少量H2O的简单溶液过程稳定γ-CsPbI3薄膜.
- 通过质子转移反应操纵尺寸依赖的相位形成.
- 使用理论计算和实验验证来了解相稳定性和属性.
主要成果:
- 成功稳定了带有内在热力学稳定性的g-CsPbI薄膜.
- 证明由于表面自由能量较低,在特定的表面面积 (>8600 m2/mol) 上,γ-CsPbI3在热力学上更优于d-CsPbI3.
- 在基于γ-CsPbI的太阳能电池中实现了与α-CsPbI3相当的光电子性能和11.3%的可重现功率转换效率.
- 在周围大气中几个月和连续几个小时运行时观察到γ-CsPbI3薄膜的稳定性.
结论:
- 热力学稳定的γ-CsPbI3薄膜的开发为不稳定的α-CsPbI3提供了可行的替代方案.
- 通过H2O介导的溶液工艺提供了一种基本的策略,以克服无机酸的相位不稳定性.
- 这项工作为基于全无机矿的高性能和稳定的光电子设备铺平了道路.
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