%0 Journal Article %1 doi:10.1021/acs.nanolett.7b03179 %A Xiao, Zhengguo %A Zhao, Lianfeng %A Tran, Nhu L. %A Lin, Yunhui Lisa %A Silver, Scott H. %A Kerner, Ross A. %A Yao, Nan %A Kahn, Antoine %A Scholes, Gregory D. %A Rand, Barry P. %D 0 %J Nano Letters %K bandgaps halide mixed perovskites stabilized %N 0 %P null %R 10.1021/acs.nanolett.7b03179 %T Mixed-Halide Perovskites with Stabilized Bandgaps %U http://dx.doi.org/10.1021/acs.nanolett.7b03179 %V 0 %X One merit of organic–inorganic hybrid perovskites is their tunable bandgap by adjusting the halide stoichiometry, an aspect critical to their application in tandem solar cells, wavelength-tunable light emitting diodes (LEDs), and lasers. However, the phase separation of mixed-halide perovskites caused by light or applied bias results in undesirable recombination at iodide-rich domains, meaning open-circuit voltage (VOC) pinning in solar cells and infrared emission in LEDs. Here, we report an approach to suppress halide redistribution by self-assembled long-chain organic ammonium capping layers at nanometer-sized grain surfaces. Using the stable mixed-halide perovskite films, we are able to fabricate efficient and wavelength-tunable perovskite LEDs from infrared to green with high external quantum efficiencies of up to 5\%, as well as linearly tuned VOC from 1.05 to 1.45 V in solar cells.

@article{doi:10.1021/acs.nanolett.7b03179, abstract = { One merit of organic–inorganic hybrid perovskites is their tunable bandgap by adjusting the halide stoichiometry, an aspect critical to their application in tandem solar cells, wavelength-tunable light emitting diodes (LEDs), and lasers. However, the phase separation of mixed-halide perovskites caused by light or applied bias results in undesirable recombination at iodide-rich domains, meaning open-circuit voltage (VOC) pinning in solar cells and infrared emission in LEDs. Here, we report an approach to suppress halide redistribution by self-assembled long-chain organic ammonium capping layers at nanometer-sized grain surfaces. Using the stable mixed-halide perovskite films, we are able to fabricate efficient and wavelength-tunable perovskite LEDs from infrared to green with high external quantum efficiencies of up to 5\%, as well as linearly tuned VOC from 1.05 to 1.45 V in solar cells. }, added-at = {2017-10-16T09:27:50.000+0200}, author = {Xiao, Zhengguo and Zhao, Lianfeng and Tran, Nhu L. and Lin, Yunhui Lisa and Silver, Scott H. and Kerner, Ross A. and Yao, Nan and Kahn, Antoine and Scholes, Gregory D. and Rand, Barry P.}, biburl = {https://www.bibsonomy.org/bibtex/2af63d3a2f68e43e5f550fb99b45c2fec/sere}, doi = {10.1021/acs.nanolett.7b03179}, eprint = {http://dx.doi.org/10.1021/acs.nanolett.7b03179}, interhash = {65ed41b15e6607ff59987b2eae73a7da}, intrahash = {af63d3a2f68e43e5f550fb99b45c2fec}, journal = {Nano Letters}, keywords = {bandgaps halide mixed perovskites stabilized}, note = {PMID: 28968126}, number = 0, pages = {null}, timestamp = {2017-10-16T09:27:50.000+0200}, title = {Mixed-Halide Perovskites with Stabilized Bandgaps}, url = {http://dx.doi.org/10.1021/acs.nanolett.7b03179}, volume = 0, year = 0 }