In this article, we have fabricated photovoltaic devices based on the poly(3-hexylthiophene)-TiO 2 nanorod bulk heterojunction. The microscopic mechanisms of charge separation and charge transport in the poly(3-hexylthiophene)-TiO 2 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 À2 , an open circuit voltage of 0.69 V, a fill factor of 0.63 under simulated A.M. 1.5 illumination (100 mW cm À2 ). The corresponding power conversion efficiency under 1 sun is about 1.14%.
Building digital heritage requires substantial resources in materials, expertise, tools, and cost. Projects supported by governments and academics can only cover a small part of the world's heritage in both time and space dimensions. The preservation coverage problem is most serious in domains where sources of intellectual and cultural heritage may diminish or disappear over time. A central notion that helps resolve these issues is to facilitate global reach of digital technology to sources of valuable heritage. We propose an approach to exploit noninstitutional resources for wider participation and coverage in digital heritage endeavor. The approach attempts to replicate institutional digital heritage work by teaming up non-institutional resources and providing standard practice.
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