Nazim Mohammed, Kim Jae Hyun
Division of Energy Technology, Daegu Gyeongbuk Institute of Science & Technology (DGIST), 333 Techno Jungang-Daero, Hyeonpung-Myeon, Dalseong-Gun, Daegu 42988, Republic of Korea.
ACS Omega. 2020 Jun 22;5(26):16106-16119. doi: 10.1021/acsomega.0c01667. eCollection 2020 Jul 7.
Organometallic halide perovskites, as the light-harvesting material, have been extensively used for cost-effective energy production in high-performance perovskite solar cells, despite their poor stability in the ambient atmosphere. In this work, methylammonium lead iodide, CHNHPbI, perovskite was successfully doped with KMnO using antisolvent crystallization to develop micrometer-length perovskite microrods. Thus, the obtained KMnO-doped perovskite microrods have exhibited sharp, narrow, and red-shifted photoluminescence band, as well as high lattice strain with improved thermal stability compared to undoped CHNHPbI. During the synthesis of the KMnO-doped perovskite microrods, a low boiling point solvent, anhydrous chloroform, was employed as an antisolvent to facilitate the emergence of controlled-size perovskite microrods. The as-synthesized KMnO-doped perovskite microrods retained the pristine perovskite crystalline phases and lowered energy band gap (∼1.57 eV) because of improved light absorption and narrow fluorescence emission bands (fwhm < 10 nm) with improved lattice strain (∼4.42 × 10), Goldsmith tolerance factor (∼0.89), and high dislocation density (∼5.82 × 10), as estimated by Williamson-Hall plots. Thus, the obtained results might enhance the optical properties with reduced energy band gap and high thermal stability of doped-perovskite nanomaterials in ambient air for diverse optoelectronic applications. This study paves the way for new insights into chemical doping and interaction possibilities in methylamine-based perovskite materials with various metal dopants for further applications.
有机金属卤化物钙钛矿作为光捕获材料，尽管其在环境大气中稳定性较差，但已被广泛用于高性能钙钛矿太阳能电池中具有成本效益的能源生产。在这项工作中，通过反溶剂结晶法成功地用KMnO对甲基碘化铅（CH₃NH₃PbI₃）钙钛矿进行了掺杂，以制备微米级长度的钙钛矿微棒。因此，与未掺杂的CH₃NH₃PbI₃相比，所获得的KMnO掺杂的钙钛矿微棒表现出尖锐、狭窄且红移的光致发光带，以及具有改善的热稳定性的高晶格应变。在合成KMnO掺杂的钙钛矿微棒过程中，使用低沸点溶剂无水氯仿作为反溶剂，以促进尺寸可控的钙钛矿微棒的出现。合成的KMnO掺杂的钙钛矿微棒保留了原始钙钛矿晶相，并且由于光吸收的改善、窄荧光发射带（半高宽<10nm）以及改善的晶格应变（4.42×10⁻³）、戈德史密斯容限因子（0.89）和高位错密度（5.82×10¹⁴）（通过威廉姆森-霍尔图估计），其能带隙降低（1.57eV）。因此，所获得的结果可能会增强掺杂钙钛矿纳米材料在环境空气中的光学性能，降低其能带隙并提高其热稳定性，以用于各种光电子应用。这项研究为深入了解基于甲胺的钙钛矿材料与各种金属掺杂剂之间的化学掺杂和相互作用可能性开辟了道路，以便进一步应用。
