Hybrid photovoltaic cells based on ZnO/Sb2S3/P3HT heterojunctions

✍ Scribed by C. P. Liu; H. E. Wang; T. W. Ng; Z. H. Chen; W. F. Zhang; C. Yan; Y. B. Tang; I. Bello; L. Martinu; W. J. Zhang; S. K. Jha

• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 513 KB
• Volume: 249
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.201147393

✦ Synopsis

Abstract

We demonstrate hybrid photovoltaic (PV) cells based on n–i–p heterojunctions with incorporated zinc oxide (ZnO) films using a sol–gel method. The cells, employing stibnite (Sb~2~S~3~), and poly(3‐hexylthiophene) (P3HT) materials, as light absorption layers, constitute an active region in the indium tin oxide (ITO)/ZnO(n)/Sb~2~S~3~(i)/P3HT(p)/Ag hybrid structure. Our investigation shows that annealing temperature has a significant effect on both the crystallinity and optical absorption of Sb~2~S~3~ films. The near‐intrinsic Sb~2~S~3~ films annealed at 300 °C exhibits dark conductivity of 1.42 × 10^−7^ S cm^−1^. The performance of PV cells strongly depends on thermal treatment of Sb~2~S~3~, and on the thickness of both the Sb~2~S~3~ and P3HT layers. Electronic structures of annealed Sb~2~S~3~ films was further studied by photoelectron spectroscopy to understand the physics behind.