Fluorescence and photoelectrochemical behavior of chlorophyll a adsorbed on a na

2020-03-30 06:51:21

efficiency ETA fluorescence sensitization

责任者: Bedja, I;Kamat, PV;Hotchandani, S 单位: UNIV QUEBEC,GRP RECH ENERGIE & INFORMAT BIOMOL,TROIS RIVIERES,PQ G9A 5H7,CANADA.;UNIV NOTRE DAME,RADIAT LAB,NOTRE DAME,IN 46556. 来源出处: JOURNAL OF APPLIED PHYSICS, v 80, OCT 15 1996, p 4637- 4643 摘要: Fluorescence and photoelectrochemical studies of chlorophyll a (Chi a) adsorbed on nanocrystalline SnO2 film were carried out. The results of fluorescence and incident photon to current conversion efficiency (IPCE) as a function of applied bias suggest that the fluorescence quenching and the photocarrier generation are interrelated. Fluorescence quenching has thus been utilized to determine the photogeneration efficiency, eta(e), of charges in a SnO/(2)Chl a based photoelectrochemical cell. A value of 0.75 was obtained for eta(e) for unbiased cells. With an IPCE of 13%, eta(e) of 75%, and a Light harvesting efficiency of 70%, the charge collection efficiency of similar to 23% was evaluated, These results suggest that the losses due to the charge recombination are a major factor that limit the efficiency of the cells. (C) 1996 American Institute of Physics. 关键词: magnetic multilayers; soft magnetic films; METAL-FREE PHTHALOCYANINE; PHOTOINDUCED ELECTRON-TRANSFER; DYE-SENSITIZATION SYSTEM; ENERGY-GAP DEPENDENCE; SPECTRAL DYE-SENSITIZATION SYSTEM; ENERGY-GAP DEPENDENCE; SPECTRAL SENSITIZATION; TITANIUM-DIOXIDE; SANDWICH CELLS; RHODAMINE-B; SENSITIZATION; TITANIUM-DIOXIDE; SANDWICH CELLS; RHODAMINE-B; SEMICONDUCTOR; LIGHT SEMICONDUCTOR; LIGHT