An Efficient, "Burn in" Free Organic Solar Cell Employing a Nonfullerene Electron Acceptor

被引：177

作者：

Cha, Hyojung ^{[1
,2
]}

Wu, Jiaying ^{[1
,2
]}

Wadsworth, Andrew ^{[1
,2
]}

Nagitta, Jade ^{[1
,2
]}

Limbu, Saurav ^{[2
,3
]}

Pont, Sebastian ^{[1
,2
]}

Li, Zhe ^{[4
]}

Searle, Justin ^{[4
]}

Wyatt, Mark F. ^{[5
]}

Baran, Derya ^{[6
]}

Kim, Ji-Seon ^{[2
,3
]}

McCulloch, Iain ^{[1
,2
,6
]}

Durrant, James R. ^{[1
,2
,4
]}

机构：

[1] Imperial Coll London, Dept Chem, London SW7 2AZ, England

[2] Imperial Coll London, Ctr Plast Elect, London SW7 2AZ, England

[3] Imperial Coll London, Dept Phys, London SW7 2AZ, England

[4] Swansea Univ, Baglan Bay Innovat Ctr, Coll Engn, SPECIF IKC, Swansea SA12 7AX, W Glam, Wales

[5] Swansea Univ, Sch Med, EPSRC UK Natl Mass Spectrometry Facil NMSF, Singleton Pk, Swansea SA2 8PP, W Glam, Wales

[6] KAUST, KAUST Solar Ctr KSC, Phys Sci & Engn Div, Thuwal 239556900, Saudi Arabia

来源：

ADVANCED MATERIALS | 2017年 / 29卷 / 33期

基金：

英国工程与自然科学研究理事会;

关键词：

charge separation; nonfullerene acceptors; organic solar cells; trap assisted recombination; CHARGE SEPARATION; FULLERENE; DEGRADATION; STABILITY;

D O I：

10.1002/adma.201701156

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 C-71 butyric acid methyl ester (PC71BM) 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: PC71BM 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: EHIDTBR solar cell shows negligible burn in efficiency loss. Furthermore, PffBT4T-2OD: EH-IDTBR solar cells are found to be substantially more stable under 85 degrees C thermal stress than PffBT4T-2OD: PC71BM devices.

引用

页数：8

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