Characterization of Incidental Photon-to-electron Conversion Efficiency (IPCE) of porous TiO2/SnO2 composite film

• The calculation of IPCE for heterojunction used in photoconduction is established.
• A TiO2/SnO2 composite system with 11 ingredient points is fabricated and tested.
• The sample whose mole ratio is TiO2:SnO2 = 2:8 have the best IPCE.
• The best IPCE is attributed to the match of energy band and the conductive channel.

Heterojunctions have good ability on the generation and separation of electron–hole pairs. In this study, in order to evaluate the conversion efficiency of the heterojunction in metal oxide semiconductors based on the photoconductivity measurement, the calculation of Incidental Photon-to-electron Conversion Efficiency (IPCE) which is suitable for photoconduction are established. Meanwhile, a TiO2/SnO2 composite system including 11 ingredient points is fabricated. The photoconductivities under different light sources are measured and IPCE of each sample are calculated. The sample whose mole ratio TiO2:SnO2 = 2:8 have the best IPCE. It is found that the IPCE for photoconduction assesses the separation efficiency better than photoconductivity dose. The reasons why different ingredient points exhibit the different photoconductivity and IPCE are discussed in details.

Figure optionsDownload as PowerPoint slide