Hsu F.-C.Huang Y.-C.Liao Y.-C.Hsu J.-H.Yen W.-C.Chen C.-W.WEI-FANG SUCHUN-WEI CHEN2019-11-272019-11-27200897808194727240277786Xhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-57649097835&doi=10.1117%2f12.794757&partnerID=40&md5=9d6c837d05a9376d4ecaf39cb4edb8a8https://scholars.lib.ntu.edu.tw/handle/123456789/432861The solution processable poly(3-hexylthiophene)(P3HT)/TiO 2-nanorod hybrid material for solar cells has been successfully demonstrated. A critical issue for using hybrid heterojunction concept is the interface properties which affect the exciton separation efficiency and bi-carrier transport. To improve the interface properties, we replace the insulating surfactant on TiO2 nanorod surface with a more conductive oligomer, carboxylate terminated 3-hexylthiophene (P3HT-COOH). The enhancement of exciton separation efficiency due to better organic-inorganic interfacial compatibility can be obtained. The electron mobility for transporting in the TiO2 network is improved. A power conversion efficiency has been increased 3 times by using this new hybrid material without optimization as compared with the hybrid without P3HT-COOH modification.[SDGs]SDG7Bulk heterojunction; Charge transport; Conductive atomic force microscopy; Hybrid solar cell; Solution process; Surface modification; Atomic force microscopy; Carboxylation; Conversion efficiency; Electron mobility; Excitons; Hybrid materials; Nanorods; Photovoltaic cells; Polymers; Solar cells; Solar energy; Surface active agents; Surface treatment; Transport properties; Heterojunctionsconference paper10.1117/12.7947572-s2.0-57649097835