简介:WefabricatepolycrystallineCu(In,Ga)Se2(CIGS)filmsolarcellsonpolyimide(PI)substrateattemperatureof450°Cwithsingle-stageprocess,andobtainapoorcrystallizationofCIGSfilmswithseveralsecondaryphasesinit.Forimprovingitfurther,thetwo-stageprocessisadoptedinsteadofthesingle-stageone.AnextraCu-richCIGSlayerwiththethicknessfrom100nmto200nmisgrownonthesubstrate,andthenanotherCu-poorCIGSfilmwiththicknessof1.5-2.0μmisdepositedonit.Withthemodificationoftheevaporationprocess,thegrainsizeofabsorberlayerisincreased,andtheadditionalsecondaryphasesalmostdisappear.Accordingly,theoveralldeviceperformanceisimproved,andtheconversionefficiencyisenhancedbyabout20%.
简介:新奇biopolymer,脱氧核糖核酸acid-hexadecyltrimethylammonium氯化物(DNA-HCTAC),当在光波导的核心层材料,和cleanroom技术成功地被使用与低繁殖损失制作单个模式的隧道波导,被使用。准备DNA-HCTAC材料在光电信波长显示出高光的质量,例如高透明性,相对高的折射索引和低birefringence。在制造途径,polymethylmethacrylate(PMMA)被用作障碍层保护DNA-HCTAC材料免受光致抗蚀剂开发者的腐蚀剂的伤害,并且蚀刻的条件被优化形成光滑的墙和波导的锋利的剖面图。最后,DNA-HCTAC隧道波导的光特征被测量。结果证明DNA-HCTAC波导与单个模式的繁殖操作并且有低光损失。
简介:Chalcopyrite-typeCuInSe2nanoparticlesaresuccessfullypreparedbyusingIn2Se3nanoparticlesasaprecursorreactedwithcopperchloride(CuCl)solutionviaaphasetransformationprocessinlowtemperature.Thereactiontimeisakeyparameter.Afterthereactiontimeincreasingfrom0.5hto8h,In2Se3andCuClreactwitheachothergraduallyviaphasetransformationintoCuInSe2withoutanyintermediatephase.ThecrystallinestructureandmorphologyoftheCuInSe2nanoparticlesarecharacterizedbyX-raydiffraction(XRD)andfieldemissionscanningelectronmicroscopy(FESEM).ThediameterofCuInSe2nanoparticleswithgooddispersibilityrangesfrom10nmto20nm.ThebandgapoftheCuInSe2nanoparticlesis1.04eVcalculatedfromtheultraviolet-visible(UV-VIS)spectrum.
简介:Alow-thresholdefficienthigh-repetition-rateeye-safeopticalparametricoscillator(OPO)ispresented.TheOPOisbasedonanx-cutnon-criticallyphase-matched(NCPM)KTAintra-cavitypumpedbyanacousto-optically(A-O)Q-switchedNd:YVO4laser.At10kHz,thelowestthresholdof0.75Wandthesignalpowerof0.6Waregot,correspondingtothesinglepulseenergyof60μJandthepeakpowerof20kW.Tuningthefrequency,themaximumoutputpowerat1536nmis1.03Wat30kHzwithanoptical-to-opticalconversionefficiencyof12.26%.Thefluctuationoftheoutputpoweris2.1%during2hoperation.