Photovoltaic Properties of a Porphyrin‐Containing Polymer as Donor in Bulk Heterojunction Solar Cells With Low Energy Loss. Issue 1 (6th December 2017)

• Record Type: Journal Article
• Authors: Bucher, Léo; Tanguy, Loïc; Desbois, Nicolas; Karsenti, Paul‐Ludovic; Harvey, Pierre D.; Gros, Claude P.; Sharma, Ganesh D.
• Is Part Of: Solar RRL. Volume 2:Issue 1(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-12-06
• Subjects: porphyrin‐diketopyrrolopyrrole -- D‐π‐A polymers -- bulk heterojunction -- polymer solar cells -- low voltage loss -- power conversion efficiency -- thermal and solvent vapour annealing; Solar energy -- Periodicals; Photovoltaic power generation -- Periodicals; Solar energy -- Research -- Periodicals; Photovoltaic power generation -- Research -- Periodicals; Periodicals; 333.7923
• DOI: 10.1002/solr.201700168
• Languages: English
• ISSNs: 2367-198X

Abstract

Abstract : A low bandgap D‐π‐A polymer (PPDPP ; D = Zn‐porphyrin, A = diketopyrrolopyrrole, π = ethynyle linker) has been synthesized and used as an electron donor for the fabrication of solution processed bulk heterojunction polymer solar cells (PSCs). PC71 BM is used as the electron acceptor. After the optimization of thePPDPP : PC71 BM weight ratio in 2‐methyltetrahydrofuran (2‐MeTHF), the PSC based onPPDPP : PC71 BM (1:2) showed an overall power conversion efficiency (PCE) of 4.18% with J sc = 9.75 mA cm −2, V oc = 0.78 V, and FF = 0.54. After the thermal annealing (TA) and subsequent solvent vapor annealing (SVA) of the active layer, the resulting device showed an overall PCE of 6.44% (Jsc = 13.18 mA cm −2, V oc = 0.74 V, and FF = 0.66) with a small voltage loss of 0.51 eV. The improvement in PCE after the TA and SVA treatment of the active layer is attributed to an enhancement of J sc and FF related to a more favorable nanoscale morphology for the exciton dissociation and charge transport as evidenced by the increased hole mobility. Abstract : Since organization in the solid state is of outmost importance for the optical, charge transport and photovoltaic properties, it would be imperative to control the aggregation mode "on demand" in order to design materials with tunable properties.