TiO2/Sb2S3/P3HT Based Inorganic-Organic Hybrid Heterojunction Solar Cells with Enhanced Photoelectric Conversion Performance

摘要

Hybrid inorganic-organic heterojunction solar cells (HHSCs) are successfully fabricated using Sb2S3 as a light-absorbing semiconductor, TiO2 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 Sb2S3 and (2) photo-generate highly efficient charge carrier separation at TiO2/Sb2S3 and Sb2S3/P3HT heterojunction interfaces. The power conversion efficiency (PCE) of HHSCs improves approximately fourfold by inserting the Sb2S3 layer, which can be further enhanced about four more times by optimizing the length of TiO2 nanorod arrays (NRAs). Finally, the mechanism to illustrate the effect of the length of TiO2 NRs on the PCE is discussed. This leads to a theory for achieving high-efficiency inorganic-organic solar cells.