物理化学学报
物理化學學報
물이화학학보
ACTA PHYSICO-CHIMICA SINICA
2013年
6期
1240-1246
,共7页
郭旭东%马蓓蓓%王立铎*%高瑞%董豪鹏%邱勇
郭旭東%馬蓓蓓%王立鐸*%高瑞%董豪鵬%邱勇
곽욱동%마배배%왕립탁*%고서%동호붕%구용
CdSe/ZnS量子点%ZnS包覆%量子点敏化太阳能电池%电子注入速率%飞秒瞬态吸收光谱
CdSe/ZnS量子點%ZnS包覆%量子點敏化太暘能電池%電子註入速率%飛秒瞬態吸收光譜
CdSe/ZnS양자점%ZnS포복%양자점민화태양능전지%전자주입속솔%비초순태흡수광보
CdSe/ZnS quantum dots%ZnS coating%Quantum dot sensitized solar cell%Electron injection rate%Femtosecond transient absorption spectra
合成了CdSe/ZnS核壳结构量子点(QDs),将其作为光敏剂吸附在TiO2纳米晶薄膜上,组装成量子点敏化太阳能电池(QDSSCs),从电子注入速率和电池性能两方面对QDSSCs进行了表征.为了定量研究ZnS层包覆对电子注入的影响,运用飞秒瞬态光谱技术,测试了包覆ZnS前后, CdSe-TiO2体系的电子注入速率.实验测得ZnS包覆前后电子注入速率分别为7.14×1011和2.38×1011 s-1,可以看出包覆后电子注入速率明显降低,仅为包覆前的1/3.电池器件J-V性能测试表明, ZnS作为绝缘层包覆在CdSe的表面有效提高了QDSSCs的填充因子和稳定性,但同时也导致了效率的降低.上述结果说明了电子注入速率的降低是导致电池电流和效率下降的重要原因,为今后优化核壳结构QDSSCs的电流和效率提供了依据.
閤成瞭CdSe/ZnS覈殼結構量子點(QDs),將其作為光敏劑吸附在TiO2納米晶薄膜上,組裝成量子點敏化太暘能電池(QDSSCs),從電子註入速率和電池性能兩方麵對QDSSCs進行瞭錶徵.為瞭定量研究ZnS層包覆對電子註入的影響,運用飛秒瞬態光譜技術,測試瞭包覆ZnS前後, CdSe-TiO2體繫的電子註入速率.實驗測得ZnS包覆前後電子註入速率分彆為7.14×1011和2.38×1011 s-1,可以看齣包覆後電子註入速率明顯降低,僅為包覆前的1/3.電池器件J-V性能測試錶明, ZnS作為絕緣層包覆在CdSe的錶麵有效提高瞭QDSSCs的填充因子和穩定性,但同時也導緻瞭效率的降低.上述結果說明瞭電子註入速率的降低是導緻電池電流和效率下降的重要原因,為今後優化覈殼結構QDSSCs的電流和效率提供瞭依據.
합성료CdSe/ZnS핵각결구양자점(QDs),장기작위광민제흡부재TiO2납미정박막상,조장성양자점민화태양능전지(QDSSCs),종전자주입속솔화전지성능량방면대QDSSCs진행료표정.위료정량연구ZnS층포복대전자주입적영향,운용비초순태광보기술,측시료포복ZnS전후, CdSe-TiO2체계적전자주입속솔.실험측득ZnS포복전후전자주입속솔분별위7.14×1011화2.38×1011 s-1,가이간출포복후전자주입속솔명현강저,부위포복전적1/3.전지기건J-V성능측시표명, ZnS작위절연층포복재CdSe적표면유효제고료QDSSCs적전충인자화은정성,단동시야도치료효솔적강저.상술결과설명료전자주입속솔적강저시도치전지전류화효솔하강적중요원인,위금후우화핵각결구QDSSCs적전류화효솔제공료의거.
@@@@CdSe/ZnS core/shel quantum dots (QDs) were synthesized and adsorbed onto nanocrystal ine TiO2 films for application in quantum dot sensitized solar cel s(QDSSCs). Femtosecond transient absorption spectra was measured to investigate the effect of the ZnS shel coating on electron injection from CdSe QDs to nanocrystal ine TiO2 films. The results showed a decrease in electron injection rate from 7.14×1011 to 2.38×1011 s-1 after ZnS shel coating, which means the electron injection rate only remained 1/3. The fil factor(FF) and stability of QDSSCs were improved by ZnS coating, but the photocurrent decreased, resulting in an overal decrease in efficiency. The slower electron injection rate is found to be the main cause for this decrease in photocurrent and efficiency, which matches wel with the photovoltaic property test. These results provide information for optimizing the current and efficiency of QDSSCs employing core/shel QDs.
