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10.1038/srep28618 http://scihub22266oqcxt.onion/10.1038/srep28618 C4923852!4923852!27350083     free     free     free Deprecated: Implicit conversion from float 215.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 215.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 215.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534       Sci+Rep 2016 ; 6 (ä): ä Nephropedia Template TP {{tp|p=27350083|t=2016. Role of Polar Phonons in the Photo Excited State of Metal Halide Perovskites |pdf=|usr=}}{{27350083}} gab.com Text Role of Polar Phonons in the Photo Excited State of Metal Halide Perovskites JO: Sci Rep http://www.kidney.de/pget.php?&tw=1&pmid=27350083 #FOAvip The development of high efficiency perovskite solar cells has sparked a multitude of measurements on the optical properties of these materials. For the most studied methylammonium(MA)PbI3 perovskite, a large range (6?55?meV) of exciton binding energies has been reported by various experiments. The existence of excitons at room temperature is unclear. For the MAPbX3 perovskites we report on relativistic Bethe-Salpeter Equation calculations (GW-BSE). This method is capable to directly calculate excitonic properties from first-principles. At low temperatures it predicts exciton binding energies in agreement with the reported ?large? values. For MAPbI3, phonon modes present in this frequency range have a negligible contribution to the ionic screening. By calculating the polarization in time from finite temperature molecular dynamics, we show that at room temperature this does not change. We therefore exclude ionic screening as an explanation for the experimentally observed reduction of the exciton binding energy at room temperature and argue in favor of the formation of polarons. Twit Text FOAVip Role of Polar Phonons in the Photo Excited State of Metal Halide Perovskites ????Sci Rep http://www.kidney.de/pget.php?&tw=1&pmid=27350083 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=27350083 #FOAvip English Wikipedia <ref>{{Cite pmid|27350083}}</ref> Role of Polar Phonons in the Photo Excited State of Metal Halide Perovskites #MMPMID27350083 Bokdam M; Sander T; Stroppa A; Picozzi S; Sarma DD; Franchini C; Kresse G Sci Rep 2016[]; 6 (ä): ä PMID27350083show ga The development of high efficiency perovskite solar cells has sparked a multitude of measurements on the optical properties of these materials. For the most studied methylammonium(MA)PbI3 perovskite, a large range (6?55?meV) of exciton binding energies has been reported by various experiments. The existence of excitons at room temperature is unclear. For the MAPbX3 perovskites we report on relativistic Bethe-Salpeter Equation calculations (GW-BSE). This method is capable to directly calculate excitonic properties from first-principles. At low temperatures it predicts exciton binding energies in agreement with the reported ?large? values. For MAPbI3, phonon modes present in this frequency range have a negligible contribution to the ionic screening. By calculating the polarization in time from finite temperature molecular dynamics, we show that at room temperature this does not change. We therefore exclude ionic screening as an explanation for the experimentally observed reduction of the exciton binding energy at room temperature and argue in favor of the formation of polarons. äRole of Polar Phonons in the Photo Excited State of Metal Halide Perov(epmc).pdf DeepDyve Pubget Overpricing