Journal
ACS NANO
Volume 9, Issue 1, Pages 371-377Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn505378m
Keywords
organic solar cells; bulk heterojunctions; hole-transporting layers; interface engineering; interfacial interaction
Categories
Funding
- Department of Energy Office of Basic Energy Sciences [DE-FG02-08ER46535]
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The intrinsic acidic nature of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hole-transporting layer (HTL) induces interfacial protonation and limits the device performance in organic solar cells based on basic pyridylthiadiazole units. By utilizing a pH neutral, water/alcohol soluble conjugated polyelectrolyte CPE-K as the HTL in p-DTS(PTTh2)(2):PC71BM solar cells, a 60% enhancement in PCE has been obtained with an increased V-bi, reduced R-s, and improved charge extraction. These effects originate from the elimination of interfacial protonation and energy barrier compared with the PEDOT:PSS HTL.
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