Wang Yiliu, Jia Chuancheng, Fan Zheng, Lin Zhaoyang, Lee Sung-Joon, Atallah Timothy L, Caram Justin R, Huang Yu, Duan Xiangfeng
Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States.
Department of Materials Science and Engineering, University of California, Los Angeles, California 90095, United States.
Nano Lett. 2021 Feb 10;21(3):1454-1460. doi: 10.1021/acs.nanolett.0c04594. Epub 2021 Jan 19.
All-inorganic lead halide perovskites have attracted tremendous interest for their excellent stability when compared with hybrid perovskites. Here we report a large-area growth of monocrystalline all-inorganic perovskite thin films and further patterning them into heterostructure arrays. We show that highly oriented CsPbBr microcrystal domains can be readily grown on muscovite mica substrates with a well-defined epitaxial relationship, which can further expand and eventually merge into large-area monocrystalline CsPbBr thin films with an excellent optical quality. Taking a step further, we show the large-area CsPbBr thin film can be further patterned and selectively transformed into CsPbI using a selective anion-exchange process to produce CsPbBr-CsPbI lateral heterostructure arrays with spatially modulated photoluminescence emission and an apparent current rectification behavior. The capability to grow large-area CsPbBr monocrystalline thin films and heterostructure arrays defines a robust material platform for both the fundamental investigations and potential applications in optoelectronics.
与混合钙钛矿相比，全无机铅卤化物钙钛矿因其出色的稳定性而引起了极大的关注。在此，我们报道了大面积单晶全无机钙钛矿薄膜的生长，并进一步将其图案化为异质结构阵列。我们表明，高度取向的CsPbBr微晶畴可以很容易地在具有明确外延关系的白云母基板上生长，这些微晶畴可以进一步扩展并最终合并成具有优异光学质量的大面积单晶CsPbBr薄膜。更进一步，我们展示了大面积的CsPbBr薄膜可以通过选择性阴离子交换过程进一步图案化并选择性地转化为CsPbI，以产生具有空间调制光致发光发射和明显电流整流行为的CsPbBr-CsPbI横向异质结构阵列。大面积CsPbBr单晶薄膜和异质结构阵列的生长能力为光电子学的基础研究和潜在应用定义了一个强大的材料平台。
