Premium
Photovoltaic Properties of a Porphyrin‐Containing Polymer as Donor in Bulk Heterojunction Solar Cells With Low Energy Loss
Author(s) -
Bucher Léo,
Tanguy Loïc,
Desbois Nicolas,
Karsenti PaulLudovic,
Harvey Pierre D.,
Gros Claude P.,
Sharma Ganesh D.
Publication year - 2018
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201700168
Subject(s) - polymer solar cell , materials science , porphyrin , heterojunction , annealing (glass) , energy conversion efficiency , band gap , exciton , electron mobility , active layer , acceptor , polymer , photochemistry , optoelectronics , chemistry , nanotechnology , layer (electronics) , thin film transistor , physics , quantum mechanics , condensed matter physics , composite material
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). PC 71 BM is used as the electron acceptor. After the optimization of the PPDPP : PC 71 BM weight ratio in 2‐methyltetrahydrofuran (2‐MeTHF), the PSC based on PPDPP : PC 71 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% (J sc = 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.