Journal
ORGANIC ELECTRONICS
Volume 41, Issue -, Pages 274-279Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2016.11.015
Keywords
Solar cell; Phonon; Temperature
Funding
- United States Department of Energy SunShot Program [DE-EE0006708, DE-EE0005310]
- US-Israel Binational Science Foundation
- Ente Nazionale Energia e Ambiente
- Italian Ministry of Foreign Affairs
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We measure the diurnal dependence of the operating characteristics of tetraphenyldibenzoperiflanthene (DBP): C-70 planar-mixed heterojunction small-molecule organic photovoltaic (OPV) cells with 2,2 ',2 ''-(1,3,5-benzenitryl tris-[1-phenyl-1H-benzimidazole] (TPBi): C-70 electron-filtering cathode buffer layers. Over the course of a day, efficiency gradually increases as a result of a concomitant increase in short-circuit current, while the fill factor and open-circuit voltage remain constant. The results are analyzed on the basis of independent measurements of temperature-and intensity-dependent OPV performance. The power conversion efficiency is maximized slightly below 1 sun intensity and at 40 degrees C, which is beneficial for practical outdoor operation. We attribute the increased short circuit current with temperature to broadening of the absorption spectrum due to population of phonon states along with increased charge mobility, which also results in an increase in fill factor. (C) 2016 Elsevier B.V. All rights reserved.
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