Conductive conjugated polyelectrolyte as hole-transporting layer for organic bulk heterojunction solar cells
Huiqiong Zhou1, Yuan Zhang, Cheng-Kang Mai
1Center for Polymers and Organic Solids, University of California, Santa Barbara, Santa Barbara, CA, 93106, USA.
Abstract:
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been extensively used as the hole-transporting layer (HTL) in bulk heterojunction (BHJ) solar cells, however, its anisotropic electrical conduction and intrinsic acidic nature generally limit the device performance. Here we demonstrate the application of a water/alcohol soluble CPE (CPE-K) as HTLs in BHJ solar cells, achieving a PCE up to 8.2%. The more superior and uniform vertical electrical conductivity found in CPE-K reduces the series resistance and provides efficient hole extraction.
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