An Efficient, “Burn in” Free Organic Solar Cell Employing a Nonfullerene Electron Acceptor
Type
ArticleAuthors
Cha, HyojungWu, Jiaying
Wadsworth, Andrew

Nagitta, Jade
Limbu, Saurav
Pont, Sebastian
Li, Zhe
Searle, Justin
Wyatt, Mark F.
Baran, Derya

Kim, Ji-Seon
McCulloch, Iain

Durrant, James R.

KAUST Department
Chemical Science ProgramKAUST Solar Center (KSC)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
KAUST Grant Number
OSR-2015-CRG4-2572Date
2017-06-28Online Publication Date
2017-06-28Print Publication Date
2017-09Permanent link to this record
http://hdl.handle.net/10754/625643
Metadata
Show full item recordAbstract
A comparison of the efficiency, stability, and photophysics of organic solar cells employing poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3'″-di(2-octyldodecyl)-2,2';5',2″;5″,2'″-quaterthiophen-5,5'″-diyl)] (PffBT4T-2OD) as a donor polymer blended with either the nonfullerene acceptor EH-IDTBR or the fullerene derivative, [6,6]-phenyl C71 butyric acid methyl ester (PC71 BM) as electron acceptors is reported. Inverted PffBT4T-2OD:EH-IDTBR blend solar cell fabricated without any processing additive achieves power conversion efficiencies (PCEs) of 9.5 ± 0.2%. The devices exhibit a high open circuit voltage of 1.08 ± 0.01 V, attributed to the high lowest unoccupied molecular orbital (LUMO) level of EH-IDTBR. Photoluminescence quenching and transient absorption data are employed to elucidate the ultrafast kinetics and efficiencies of charge separation in both blends, with PffBT4T-2OD exciton diffusion kinetics within polymer domains, and geminate recombination losses following exciton separation being identified as key factors determining the efficiency of photocurrent generation. Remarkably, while encapsulated PffBT4T-2OD:PC71 BM solar cells show significant efficiency loss under simulated solar irradiation (“burn in” degradation) due to the trap-assisted recombination through increased photoinduced trap states, PffBT4T-2OD:EH-IDTBR solar cell shows negligible burn in efficiency loss. Furthermore, PffBT4T-2OD:EH-IDTBR solar cells are found to be substantially more stable under 85 °C thermal stress than PffBT4T-2OD:PC71BM devices.Citation
Cha H, Wu J, Wadsworth A, Nagitta J, Limbu S, et al. (2017) An Efficient, “Burn in” Free Organic Solar Cell Employing a Nonfullerene Electron Acceptor. Advanced Materials 29: 1701156. Available: http://dx.doi.org/10.1002/adma.201701156.Sponsors
The authors gratefully acknowledge funding supported by KAUST under the Grant Agreement number OSR-2015-CRG4-2572, the EU FP7 project CHEETAH, the EPSRC through the Centre for Doctoral Training in Plastic Electronics (EP/L0160702/1) and thank Pabitra Shakya for assistance in device fabrication.Publisher
WileyJournal
Advanced MaterialsPubMed ID
28657152Additional Links
http://onlinelibrary.wiley.com/doi/10.1002/adma.201701156/fullae974a485f413a2113503eed53cd6c53
10.1002/adma.201701156
Scopus Count
Related articles
- Revealing the Effect of Additives with Different Solubility on the Morphology and the Donor Crystalline Structures of Organic Solar Cells.
- Authors: Zhao J, Zhao S, Xu Z, Qiao B, Huang D, Zhao L, Li Y, Zhu Y, Wang P
- Issue date: 2016 Jul 20
- The binding energy and dynamics of charge-transfer states in organic photovoltaics with low driving force for charge separation.
- Authors: Dong Y, Cha H, Zhang J, Pastor E, Tuladhar PS, McCulloch I, Durrant JR, Bakulin AA
- Issue date: 2019 Mar 14
- Graded Morphologies and the Performance of PffBT4T-2OD:PC(71)BM Devices Using Additive Choice.
- Authors: Gaspar H, Parnell AJ, Pérez GE, Viana JC, King SM, Mendes A, Pereira L, Bernardo G
- Issue date: 2021 Dec 12
- Thiophene- and Carbazole-Substituted N-Methyl-Fulleropyrrolidine Acceptors in PffBT4T-2OD Based Solar Cells.
- Authors: Gaspar H, Figueira F, Strutyński K, Melle-Franco M, Ivanou D, Tomé JPC, Pereira CM, Pereira L, Mendes A, Viana JC, Bernardo G
- Issue date: 2020 Mar 11
- Unraveling the efficiency-limiting morphological issues of the perylene diimide-based non-fullerene organic solar cells.
- Authors: Singh R, Suranagi SR, Lee J, Lee H, Kim M, Cho K
- Issue date: 2018 Feb 12