Remote Tuning of Bandgap and Emission of Lead Perovskites by Spatially Controlled Halide Exchange Reactions,ACS Materials Letters

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Remote Tuning of Bandgap and Emission of Lead Perovskites by Spatially Controlled Halide Exchange Reactions
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-02-28 , DOI: 10.1021/acsmaterialslett.0c00036
Md Jahidul Islam ₁ , Md Shahjahan ₁ , Ken-ichi Yuyama _{1,

2} , Vasudevanpillai Biju _{1,

2}

Affiliation

Local halide exchange reactions enable one to fabricate heterojunction perovskites; however, it is particularly challenging to deliver reactive halide precursors at the desired position. Here, we report an innovative approach for the fabrication of heterojunction perovskites by the localized halide exchange. We demonstrate the tuning of bandgap and the emission color of the desired domain in a lead halide perovskite microrod, which is realized by increasing the local concentration of the halide precursor under optical trapping using a nonresonant near-infrared laser beam. Similarly, the bandgap and the emission color of a crystal among several crystals are temporally tuned by a locally induced halide exchange reaction. Using this method, we overcome spontaneous halide exchange at undesired locations or crystals. We minimize photothermal and photochemical effects on halide exchange and photoinduced damage to the crystals by optical trapping using a 1064 nm continuous wave laser beam. The site-specific halide exchange offers flexible spatial control of bandgap and photoluminescence for designing perovskite-based heterojunction structures by laser scanning.

中文翻译：

通过空间控制的卤化物交换反应远程调节能隙和铅钙钛矿的排放

局部卤化物交换反应使人们可以制造异质结钙钛矿；然而，将反应性卤化物前体递送至所需位置特别具有挑战性。在这里，我们报告了一种通过局部卤化物交换制造异质结钙钛矿的创新方法。我们演示了带隙和调谐所需的域中的卤化钙钛矿微棒中的带隙的调谐，这是通过在使用非谐振近红外激光束的光阱下增加卤化物前体的局部浓度来实现的。类似地，通过局部诱导的卤化物交换反应在时间上调节几个晶体之间的晶体的带隙和发光颜色。使用这种方法，我们克服了在不希望的位置或晶体上发生的自发卤化物交换。我们通过使用1064 nm连续波激光束进行光阱捕获，将对卤化物交换的光热和光化学效应以及对晶体的光诱导损伤降至最低。特定位置的卤化物交换可灵活地控制带隙和光致发光，从而通过激光扫描设计基于钙钛矿的异质结结构。

更新日期：2020-02-28

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