当前位置：
X-MOL 学术
›
J. Phys. Chem. Lett.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Stability of Cubic FAPbI3 from X-ray Diffraction, Anelastic, and Dielectric Measurements
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2019-05-01 00:00:00 , DOI: 10.1021/acs.jpclett.9b00896 Francesco Cordero 1 , Floriana Craciun 1 , Francesco Trequattrini 1, 2 , Amanda Generosi 1 , Barbara Paci 1 , Anna Maria Paoletti 3 , Giovanna Pennesi 3
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2019-05-01 00:00:00 , DOI: 10.1021/acs.jpclett.9b00896 Francesco Cordero 1 , Floriana Craciun 1 , Francesco Trequattrini 1, 2 , Amanda Generosi 1 , Barbara Paci 1 , Anna Maria Paoletti 3 , Giovanna Pennesi 3
Affiliation
|
Among the hybrid metal–organic perovskites for photovoltaic applications, FAPbI3 (FAPI) has the best performance regarding efficiency and the worst regarding stability, even though the reports on its stability are highly contradictory. In particular, since at room temperature the cubic α phase, black and with high photovoltaic efficiency, is metastable against the yellow hexagonal δ phase, it is believed that α-FAPI spontaneously transforms into δ-FAPI within a relatively short time. We performed X-ray diffraction and thermogravimetric measurements on loose powder of FAPI, and present the first complete dielectric and anelastic spectra of compacted FAPI samples under various conditions. We found that α-FAPI is perfectly stable for at least 100 days, the duration of the experiments, unless extrinsic factors induce its degradation. In our tests, degradation was detected after exposure to humidity, strongly accelerated by grain boundaries and the presence of δ phase, but it was not noticeable on the loose powder kept in air under normal laboratory illumination. These findings have strong implications on the strategies for improving the stability of FAPI without diminishing its photovoltaic efficiency through modifications of its composition.
中文翻译：
从X射线衍射，非弹性和介电测量结果得出的立方FAPbI 3的稳定性
在用于光伏应用的混合金属-有机钙钛矿中，FAPbI 3（FAPI）在效率方面表现最佳，而在稳定性方面则表现最差，即使有关其稳定性的报告相互矛盾。特别地，由于在室温下黑色且具有高光伏效率的立方α相相对于黄色六边形δ相是亚稳态的，因此认为α-FAPI在相对短的时间内自发地转变为δ-FAPI。我们对FAPI的散粉进行了X射线衍射和热重测量，并给出了在各种条件下压实的FAPI样品的第一个完整的介电和非弹性光谱。我们发现，α-FAPI至少在实验期间至少100天是完全稳定的，除非外部因素导致其降解。在我们的测试中，在暴露于湿气后检测到降解，晶界和δ相的存在会强烈加速，但是在正常实验室照明下，保持在空气中的疏松粉末上并不明显。这些发现对改进FAPI的稳定性而不通过改变其成分而降低其光电效率的策略具有重要的意义。
更新日期：2019-05-01
中文翻译：
从X射线衍射，非弹性和介电测量结果得出的立方FAPbI 3的稳定性
在用于光伏应用的混合金属-有机钙钛矿中，FAPbI 3（FAPI）在效率方面表现最佳，而在稳定性方面则表现最差，即使有关其稳定性的报告相互矛盾。特别地，由于在室温下黑色且具有高光伏效率的立方α相相对于黄色六边形δ相是亚稳态的，因此认为α-FAPI在相对短的时间内自发地转变为δ-FAPI。我们对FAPI的散粉进行了X射线衍射和热重测量，并给出了在各种条件下压实的FAPI样品的第一个完整的介电和非弹性光谱。我们发现，α-FAPI至少在实验期间至少100天是完全稳定的，除非外部因素导致其降解。在我们的测试中，在暴露于湿气后检测到降解，晶界和δ相的存在会强烈加速，但是在正常实验室照明下，保持在空气中的疏松粉末上并不明显。这些发现对改进FAPI的稳定性而不通过改变其成分而降低其光电效率的策略具有重要的意义。
京公网安备 11010802027423号