近日，美国北卡罗来纳大学Huang, Jinsong团队研究了可调谐相干混合维钙钛矿异质结和从溶液中生长的量子阱。该项研究成果发表在2025年7月16日出版的《自然—光子学》杂志上。

高性能器件需要相干异质结、量子阱和多量子阱；这些通常是通过专用的气相外延工艺生长的。

研究组展示了由混合维钙钛矿组成的相干钙钛矿异质结和量子阱的生长，这是一种溶液过程。利用甲基铵（MA⁺）和4-（氨基甲基）胡椒啶（4AMP²⁺）的溶解度差异，他们组装了不同层数的层状钙钛矿。由此产生的4AMP-MA_n-1Pb_nI_{3n +1}材料具有不同的层数或带隙，形成量子阱。采用不同势垒厚度的4AMP-MA₂Pb₃I₁₀ （n=3）和4AMP-MAPb₂I₇ (n=2)，根据晶体生长过程中的溶液温度分布定制了异质结和量子阱。

通过循环温度分布形成了多个量子阱。平面异质结和量子阱晶格匹配，无界面缺陷，具有较强的热稳定性。在n=2/n=3异质结得到了计算和光学研究的证实。该研究为复杂钙钛矿异质结和量子阱器件的发展开辟了新的方向。

附：英文原文

Title: Tunable coherent mixed-dimensional perovskite heterojunctions and quantum wells grown from solution

Author: Shi, Zhifang, Xian, Yeming, Wang, Xiaoming, Jiao, Haoyang, Zhou, Hua, Zhang, Yugang, Ni, Zhenyi, Yan, Yanfa, Huang, Jinsong

Issue&Volume: 2025-07-16

Abstract: Coherent heterojunctions, quantum wells and multiple quantum wells are needed for high-performance devices; these are generally grown via a dedicated vapour phase epitaxy process. Here we demonstrate the growth of coherent perovskite heterojunctions and quantum wells made of mixed-dimensional perovskites using a solution process. By exploiting the solubility difference of methylammonium (MA+) and 4-(aminomethyl)piperidinium (4AMP2+), we assemble layered perovskites with different layer numbers. The resulting 4AMP-MAn–1PbnI3n+1 materials each with different layer numbers or bandgaps form quantum wells. Heterojunctions and quantum wells made of 4AMP-MA2Pb3I10 (n=3) and 4AMP-MAPb2I7 (n=2) with various barrier thickness are tailored by the solution temperature profile during crystal growth. Multiple quantum wells have been formed by cycling temperature profiles. The planar heterojunction and quantum wells have lattice matching without interfacial defects, and exhibit strong thermal stability. Type I band alignment at the n=2/n=3 heterojunction is confirmed by both computation and optical studies. This study opens a new direction for the development of sophisticated perovskite heterojunction and quantum well devices.

DOI: 10.1038/s41566-025-01723-z

Source: https://www.nature.com/articles/s41566-025-01723-z