Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 13, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3374406
Keywords
buffer layers; charge exchange; diffusion; doping; electrochemical electrodes; fluorine; polymers; power conversion; silver; solar cells; tin compounds; titanium compounds
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Funding
- National Research Laboratory Program of the Korea Science and Engineering Foundation [ROA-2006-00010274-0]
- National Research Foundation of Korea [2006-0052315, 핵06A3702] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The stability and efficiency of organic solar cells (OSCs) were improved using thermally stable fluorine-doped tin oxide (FTO) as the bottom electrode and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and TiO(2) as the buffer layers. The TiO(2) layer between FTO and the P3HT:PCBM active layer improved the interface characteristics for a better charge transfer. The PEDOT:PSS layer retarded the oxygen diffusion to the active layer. A maximum power conversion efficiency of 4.3% was obtained for the inverted structure of FTO/TiO(2)/P3HT:PCBM/PEDOT:PSS/Ag with a stable performance, and the cell retained over 65% of its initial efficiency after 500 h. Additionally, the OSCs were fabricated using all-solution based vacuum-free processes with screen printing for the Ag electrode and the results were comparable to the device that used an evaporated Ag electrode.
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