Quantification of Photophysical Processes in All-Polymer Bulk Heterojunction Solar Cells
Type
ArticleAuthors
Albalawi, AhmedKan, Zhipeng
Gorenflot, Julien

Guarracino, Paola
Chaturvedi, Neha

Privitera, Alberto
Liu, Shengjian
Gao, Yajun
Franco, Lorenzo
Beaujuge, Pierre
Laquai, Frédéric

KAUST Department
Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC)Physical Science and Engineering (PSE) Division
KAUST Solar Center (KSC)
Material Science and Engineering Program
Biological and Environmental Sciences and Engineering (BESE) Division
KAUST Grant Number
OSR-2018-CARF/CCF-3079Date
2020-04-28Online Publication Date
2020-04-28Print Publication Date
2020-06Submitted Date
2020-04-02Permanent link to this record
http://hdl.handle.net/10754/662773
Metadata
Show full item recordAbstract
All-polymer solar cells lag behind the state-of-the-art in small molecule nonfullerene acceptor (NFA) bulk heterojunction (BHJ) organic solar cells (OSCs) for reasons still unclear. Herein, the efficiency-limiting processes in all-polymer solar cells are investigated using blends of the common donor polymer PBDT-TS1 with different acceptor polymers, namely P2TPD[2F]T and P2TPDBT[2F]T. Combining data from steady-state optical spectroscopy and time-resolved photoluminescence, transient absorption, and time-delayed collection field experiments, provides not only a concise but also quantitative assessment of the losses due to limited photon absorption, geminate and nongeminate charge carrier recombination, field-dependent charge generation, and inefficient carrier extraction. Although both systems exhibit a similar charge separation efficiency in the absence of external bias, charge separation is significantly enhanced in P2TPDBT[2F]T-based blends when biased. Kinetic parameters obtained via pulsed laser spectroscopy are used to reproduce the experimentally measured device current–voltage (J–V) characteristics and indicate that low fill factors originate either from nongeminate recombination competing with charge extraction, or from a pronounced field dependence of charge generation, depending on the acceptor polymer. The methodology presented here is generic and can be used to quantify the loss processes in BHJ OSCs including both all-polymer and small molecule NFA systems.Citation
Balawi, A. H., Kan, Z., Gorenflot, J., Guarracino, P., Chaturvedi, N., Privitera, A., … Laquai, F. (2020). Quantification of Photophysical Processes in All-Polymer Bulk Heterojunction Solar Cells. Solar RRL, 2000181. doi:10.1002/solr.202000181Sponsors
This publication is based upon work supported by the King AbdullahUniversity of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No: OSR-2018-CARF/CCF-3079Publisher
WileyJournal
Solar RRLAdditional Links
https://onlinelibrary.wiley.com/doi/abs/10.1002/solr.202000181ae974a485f413a2113503eed53cd6c53
10.1002/solr.202000181