Solution-Processable PEDOT:PSS:α-In2Se3 with Enhanced Conductivity as a Hole Transport Layer for High-Performance Polymer Solar Cells

• DOI: 10.1021/acsami.0c02489
• Publication Date: 2020-05-14T08:47:00Z
• Authors: Jianming Wang; Huangzhong Yu; Chunli Hou; Jiang Zhang
• Keywords: Exfoliation joint

Two-dimensional (2D) nanosheets have attracted significant attention in photovoltaic devices recent years owing to their outstanding photoelectric properties. Herein, 2D α-In2Se3 with high conductivity and suitable work function are synthesized by liquid-phase exfoliation method. To ameliorate the low of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) (2.21 × 10-3 S cm-1), directly added into PEDOT:PSS obtain PEDOT:PSS:α-In2Se3 composite film. The film exhibits excellent optical transmittance, function, enhanced (1.54 10-2 cm-1). profoundly investigate mechanism improvement, X-ray photoelectron spectroscopy, Raman electron paramagnetic resonance, atomic force microscopy conducted. results show that synergistic effect isopropyl alcohol/deionized water cosolvent screens Coulombic attraction among PEDOT PSS. screening partial removal PSS benzoid-quinoid transition PEDOT. In addition, may serve as physical linkers for chains. Both these effects beneficial increase interfacial contact area between chains form a larger conductive network PEDOT, leading an conductivity. is first employed hole transport layer (HTL) polymer solar cells (PSCs). power conversion efficiency (PCE) poly[2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b']dithiophene)-co-(1,3-di(5-thiophene-2-yl)-5,7-bis(2-ethylhexyl)benzo[1,2-c:4,5-c']dithiophene-4,8-dione)] (PBDB-T):3,9-bis(2-methylene(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)dithieno-[2,3-d:2',3'-d']-s-indaceno[1,2-b:5,6-b']dithiophene (ITIC)-based device HTL 10% higher than unmodified PBDB-T:ITIC-based device, maximum PCE 15.89% achieved (poly[(2,6-(4,8-bis(5-(2-ethylhexyl)-4-fluorothiophen-2-yl)benzo[1,2-b:4,5-b']dithiophene))-co-(1,3-di(5-thiophene-2-yl)-5,7-bis(2-ethylhexyl)-benzo[1,2-c:4,5-c']dithiophene-4,8-dione))] (PM6):(2,2'-((2Z,2Z)-((12,13-bis(2-ethylhexyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2,″3″:4',50]thieno[2',3':4,5]pyrrolo[3,2-g]thieno[2',3':4,5]thieno[3,2-b]indole-2,10-diyl)bis(methanylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile) (Y6) system. More interestingly, stability improved Thus, can be potential material PSCs.