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Poly(4-vinylpyridine): A New Interface Layer for Organic Solar Cells

A. Sharma ; Renee Kroon (Institutionen för kemi och kemiteknik, Polymerteknologi) ; D. A. Lewis ; G. G. Andersson ; M. R. Andersson
Acs Applied Materials & Interfaces (1944-8244). Vol. 9 (2017), 12, p. 10929-10936.
[Artikel, refereegranskad vetenskaplig]

Poly(4-vinylpyridine) (P4VP) was used as a cathode interface layer in inverted organic solar cells (OSCs) fabricated using poly[2,3-bis(3-octyloxypbeny)quinoxaline-5,8-diyl-att-thiophene2,5-diyl] (TQ1) and PC71BM (phenyl C-71, butyric acid methyl ester) as the donor and acceptor materials, respectively. We successfully demonstrate that the work function of underlying indium tin oxide (ITO) electrode can be significantly reduced by,similar to 0.7 eV) after modification of the surface with a thin film of P4VP. Photoconversion efficiency of 4.7% was achieved from OSCs incorporating P4VP interface layer between the ITO and bulk heterojunction (BHJ). Thin P4VP layer, when used to modify ZnO electron transport layer in inverted OSCs, reduced the ZnO work function from 3.7 to 3.4 eV, which resulted in a noteworthy increase in open-circuit voltage from 840 to 890 mV. On simultaneous modification of ZnO with P4VP and optimization of the BHJ morphology by using solvent additive chloronapthalene, photoconversion efficiency of OSCs was significantly increased from 4.6% to 6,3%. The enhanced device parameters are also attributed to an energetically favorable material stratification, as a result of an enrichment of PC71BM toward the P4VP interface.

Nyckelord: pyridine, cathode interface layer, work function, inverted OSCs, morphology, ENERGY-LEVEL ALIGNMENT, BLOCK-COPOLYMERS, MODIFIED CATHODE, POLYMER, PERFORMANCE, EFFICIENCY, ZNO, FULLERENE, PHOTOVOLTAICS, ENHANCEMENT



Denna post skapades 2017-05-05.
CPL Pubid: 249116

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Polymerteknologi

Ämnesområden

Polymerteknologi

Chalmers infrastruktur