简介:AYAGsupershortpulselaser(355nm,35ps)isusedasanexposuresourceandthemicrowavedielectricspectri,techniqueisusedtoquicklydetectthephotoelectrondecayprocessinAgXmicrocrystals,becausethefreephotoelectronlifetimeanddecayprocesscandecidethesensitivityandotherefficienciesofsilverhalidematerial.TheresultshowsthatthefreephotoelectronaveragelifetimesofKodak-100andFuji-100colourfilmsamplesare8.5and9.5ns,respectively.
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简介:Temperature-dependentphotoluminescencecharacteristicsoforganic-inorganichalideperovskiteCH3NH3PbI3-xClxfilmspreparedusingatwo-stepmethodonZnO/FTOsubstrateswereinvestigated.Surfacemorphologyandabsorptioncharacteristicsofthefilmswerealsostudied.Scanningelectronmicroscopyrevealedlargecrystalsandsubstratecoverage.Theorthorhombic-to-tetragonalphasetransitiontemperaturewas140K.Thefilms’excitonbindingenergywas77.6±10.9meVandtheenergyofopticalphononswas38.8±2.5meV.TheseresultssuggestthatperovskiteCH3NH3PbI3-xClxfilmshaveexcellentoptoelectroniccharacteristicswhichfurthersuggeststheirpotentialusageinperovskitebasedoptoelectronicdevices.