Chang C.-H.Huang T.-K.Lin Y.-T.Lin Y.-Y.Chen C.-W.Chu T.-H.WEI-FANG SUCHUN-WEI CHEN2019-11-272019-11-27200809599428https://www.scopus.com/inward/record.uri?eid=2-s2.0-43449096031&doi=10.1039%2fb800071a&partnerID=40&md5=8d6d23df2966691a654a091ba61ec370https://scholars.lib.ntu.edu.tw/handle/123456789/432864In this article, we have fabricated photovoltaic devices based on the poly(3-hexylthiophene)-TiO2 nanorod bulk heterojunction. The microscopic mechanisms of charge separation and charge transport in the poly(3-hexylthiophene)-TiO2 nanorod nanocomposites have been investigated by photoluminescence quenching, time-resolved photoluminescence spectroscopy, and time-of-flight mobility measurements. Charge separation and transport efficiency can be improved by adding an adequate amount of TiO 2 nanorods in polymer. In addition, the device performance can be further enhanced by thermal annealing or removal of insulating surfactant in the hybrid, giving an optimized device performance of a short circuit current density of 2.62 mA cm-2, an open circuit voltage of 0.69 V, a fill factor of 0.63 under simulated A.M. 1.5 illumination (100 mW cm-2). The corresponding power conversion efficiency under 1 sun is about 1.14%. © The Royal Society of Chemistry.[SDGs]SDG7Charge transfer; Heterojunctions; Photoluminescence; Photovoltaic cells; Quenching; Solar cells; Charge separation; Photoluminescence quenching; Photovoltaic devices; Organic polymersjournal article10.1039/b800071a2-s2.0-43449096031