Controlling size and shape of semiconducting nanocrystals advances nanoelectronics and photonics. Quantum confined, inexpensive, solution derived metal halide perovskites offer narrow band, color-pure emitters as integral parts of next-generation displays and optoelectronic devices. We use nanoporous silicon and alumina thin films as templates for the growth of perovskite nanocrystallites directly within device-relevant architectures without the use of colloidal stabilization. We find significantly blue shifted photoluminescence emission by reducing the pore size; normally infrared-emitting materials become visibly red, green-emitting materials cyan and blue. Confining perovskite nanocrystals within porous oxide thin films drastically increases photoluminescence stability as the templates auspiciously serve as encapsulation. We quantify the template-induced size of the perovskite crystals in nanoporous silicon with microfocus high-energy X-ray depth profiling in transmission geometry, verifying the growth of perovskite nanocrystals throughout the entire thickness of the nanoporous films. Low-voltage electroluminescent diodes with narrow, blue-shifted emission fabricated from nanocrystalline perovskites grown in embedded nanoporous alumina thin films substantiate our general concept for next generation photonic devices.
@article{arxiv.1607.04661,
title = {Confining Metal-Halide Perovskites in Nanoporous Thin Films},
author = {Stepan Demchyshyn and Janina Melanie Roemer and Heiko Groiß and Herwig Heilbrunner and Christoph Ulbricht and Dogukan Apaydin and Uta Rütt and Florian Bertram and Günter Hesser and Markus Scharber and Bert Nickel and Niyazi Serdar Sariciftci and Siegfried Bauer and Eric Daniel Głowacki and Martin Kaltenbrunner},
journal= {arXiv preprint arXiv:1607.04661},
year = {2017}
}