title: Improvement in Half-Life of Organic Solar Cells by Using a Blended Hole Extraction Layer Consisting of PEDOT:PSS and Conjugated Polymer Electrolyte.
abstract: In this study, we fabricated conventional structured organic solar cells (OSCs) by introducing a hole extraction layer (HEL) that consisted of poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) and conjugated polymer electrolyte (CPE) poly[9,9-bis(4'-sulfonatobutyl)fluorene-alt-thiophene] (PFT-D). PFT-D has a -SO3-functional group that acts as a conjugate base against the -SO3H of PSS. In addition, the molecular dipole of PFT-D can screen the Coulombic attraction between PEDOT chains and PSS chains. By blending PEDOT:PSS and PFT-D, the acidity of the HEL solution and changes to the surface morphology and potential of the HEL film as a function of exposure time in air were reduced. As a result, the half-life of the OSC fabricated with blended HEL was five times better at room temperature and 40% humidity without encapsulation as compared to the pristine PEDOT:PSS-based device.
authors: Department of Materials Chemistry and Engineering, Konkuk University , 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea.
authors: Eui Jin
authors: EJ
authors: Lee
authors: Department of Materials Chemistry and Engineering, Konkuk University , 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea.
authors: Jae Pil
authors: JP
authors: Han
authors: Department of Materials Chemistry and Engineering, Konkuk University , 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea.
authors: Seung Eun
authors: SE
authors: Jung
authors: Department of Materials Chemistry and Engineering, Konkuk University , 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea.
authors: Min Hee
authors: MH
authors: Choi
authors: Department of Materials Chemistry and Engineering, Konkuk University , 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea.
authors: Doo Kyung
authors: DK
authors: Moon
keywords: conjugated polymer electrolytes; hole extraction layer; morphological stability; organic solar cell; phase separation; stability; surface potential