Low-band-gap, sublimable rhenium(I) diimine complex for efficient bulk heterojunction photovoltaic devices

H. L. Wong, L. S. M. Lam, K. W. Cheng, K. Y. K. Man, W. K. Chan, C. Y. Kwong, A. B. Djurišić
2004 Applied Physics Letters  
The use of chlorotricarbonyl rhenium͑I͒ diimine complex as photosensitizing molecule in photovoltaic cells is demonstrated. Unlike other transition-metal-based sensitizers, the complex is sublimable and has low band gap. It also exhibits bipolar charge transport character with relatively high carrier mobilities on the order of 10 Ϫ3 cm 2 V Ϫ1 s Ϫ1 . Multilayer heterojunction and bulk heterojunction devices with fullerene as the electron accepting molecule were prepared. For the bulk
more » ... he bulk heterojunction devices, the fill factor and power conversion efficiency under simulated solar light illumination were 0.56 and 0.48%, respectively. Atomic force microscopic images showed that the complex dispersed evenly with fullerene molecules in solid state.
doi:10.1063/1.1682676 fatcat:pobz2yfesre3xb7j6xr75eeucm