摘要
有机无机杂化钙钛矿因其优异的光电性能受到广泛关注,但是其对湿度、热的不稳定性会限制钙钛矿电池的进一步发展.本文通过简单的溶液浸泡法在导电基底上制备了尺寸为50-100nm的全无机碘化铅铯纳米线,并通过离子交换法将碘化铅铯置换成溴化铅铯纳米线.文章通过X射线衍射谱、紫外可见吸收光谱、荧光发光光谱对I离子交换成Br离子过程进行了研究.结果发现I-Br离子交换过程中伴随着晶体结构的变化,起初的碘化铅铯为非钙钛矿结构,离子交换后制备的溴化铅铯为钙钛矿结构.本文将全无机卤化铅铯纳米线应用在钙钛矿电池器件中,器件显示出优越的稳定性,放置5500小时效率几乎未衰减.
ABX3-type organic-inorganic hybrid halide perovskite materials have been recognized as promising candidates for optoelectronic applications. However, poor stability of organic-inorganic hybrid perovskite hinders their forward long-term utilization and hence an effective strategy is needed to replace the organic part with an inorganic cation. Herein, all inorganic CsPbI3 nanowires with a di- ameter of 50-100 nm are synthesized on fluorine-doped tin oxide glass via a simple solution-dipping process, which are further transformed into CsPbBr3 nanowires through a so- lution-phase halide exchange method. A phase change from non-perovskite to perovskite structure is observed during the ion substitution process of I- by Br-, which is elaborated by X-ray diffraction, absorption and photoluminescence spectra. We for the first time apply the as-formed CsPbI3 and CsPbBr3 nanowires into perovskite solar cells, yielding power conversion efficiency of 0.11% and 1.21%, respectively. The inorganic CsPbBr3 nanowire solar cell shows impressive sta- bility which still remains 99% of the initial power conversion efficiency even after 5500 h aging.
基金
supported by the National Natural Science Foundation of China(91433109 and 51472274)
Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme(2016)
the Program of Guangzhou Science and Technology(201504010031)
the Fundamental Research Funds for the Central Universities
the Natural Science Foundation of Guangdong Province (S2013030013474 and 2014A030313148)
