TiO/SbS/P3HT Based Inorganic-Organic Hybrid Heterojunction Solar Cells with Enhanced Photoelectric Conversion Performance.

Hybrid inorganic-organic heterojunction solar cells (HHSCs) are successfully fabricated using SbS as a light-absorbing semiconductor, TiO nanorods (NRs) as an electron-transport layer, and poly-3 (hexylthiophene) (P3HT) as both a hole conductor and light absorber. The enhanced photo-to-electric conversion performance is expected to (1) enhance optical absorption in the visible light region by SbS and (2) photo-generate highly efficient charge carrier separation at TiO/SbS and SbS/P3HT heterojunction interfaces. The power conversion efficiency (PCE) of HHSCs improves approximately fourfold by inserting the SbS layer, which can be further enhanced about four more times by optimizing the length of TiO nanorod arrays (NRAs). Finally, the mechanism to illustrate the effect of the length of TiO NRs on the PCE is discussed. This leads to a theory for achieving high-efficiency inorganic-organic solar cells. [ABSTRACT FROM AUTHOR]