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4669715 
Journal Article 
Isopropanol-treated PEDOT:PSS as electron transport layer in polymer solar cells 
Zhang, W; Bi, X; Zhao, X; Zhao, Z; Zhu, Jun; Dai, S; Lu, Y; Yang, S 
2014 
1 
Organic Electronics
ISSN: 1566-1199 
15 
12 
3445-3451 
WOS:000345649200004 
Isopropanol (IPA)-treated poly(3,4-ethylenedioxithiophene): poly(styrene sulfonate) (PEDOT:PSS) was applied as a new electron transport layer (ETL) in P3HT:PCBM bulk heterojunction polymer solar cell (BHJ-PSC) devices for the first time, revealing the electron transport property of IPA-treated PEDOT:PSS in sharp contrast to the well known hole transport property of the untreated PEDOT:PSS. Under the optimized condition for incorporating PEDOT:PSS ETL, the power conversion efficiency (PCE) of the ITO/untreated PEDOT:PSS (HTL)/P3HT:PCBM/IPA-treated PEDOT:PSS (ETL)/Al device (3.09%) is quite comparable to that of the reference ITO/untreated PEDOT:PSS (HTL)/P3HT:PCBM/Al device without any ETL (3.06%), and an annealing treatment of PEDOT:PSS ETL at 120 degrees C for 10 min led to a PCE of 3.25%, which even slightly surpasses that of the reference device, revealing the electron transport property of IPA-treated PEDOT:PSS. The electron transport property of IPA-treated PEDOT: PSS is interpreted by the lowering of the work function of PEDOT:PSS upon IPA treatment and incorporation as ETL as probed by scanning Kelvin probe microscopy (SKPM). (C) 2014 Elsevier B.V. All rights reserved. 
Polymer solar cells; Hole transport layer; Electron transport layer; PEDOT:PSS; Work function