The fate of electron-hole pairs in polymer: fullerene blends for organic photovoltaics

被引：71

作者：

Causa, Martina ^{[1
]}

De Jonghe-Risse, Jelissa ^{[2
,3
]}

Scarongella, Mariateresa ^{[1
,2
,3
]}

Brauer, Jan C. ^{[1
]}

Buchaca-Domingo, Ester ^{[4
,5
,6
]}

Moser, Jacques-E. ^{[2
,3
]}

Stingelin, Natalie ^{[4
,5
]}

Banerji, Natalie ^{[1
]}

机构：

[1] Univ Fribourg, Dept Chem, Chemin Musee 9, CH-1700 Fribourg, Switzerland

[2] Ecole Polytech Fed Lausanne, SB ISIC GR MO, Inst Chem Sci & Engn, Photochem Dynam Grp, Stn 6, CH-1015 Lausanne, Switzerland

[3] Ecole Polytech Fed Lausanne, SB ISIC GR MO, Lausanne Ctr Ultrafast Sci LACUS, Stn 6, CH-1015 Lausanne, Switzerland

[4] Imperial Coll London, Dept Mat, Exhibit Rd, London SW7 2AZ, England

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

[6] King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, Thuwal 239556900, Saudi Arabia

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

基金：

瑞士国家科学基金会; 欧洲研究理事会;

关键词：

CHARGE-CARRIER MOBILITY; HETEROJUNCTION SOLAR-CELLS; CONJUGATED POLYMERS; EXCITON DISSOCIATION; BULK HETEROJUNCTIONS; QUANTUM EFFICIENCY; SEPARATION; TRANSPORT; GENERATION; DYNAMICS;

D O I：

10.1038/ncomms12556

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

There has been long-standing debate on how free charges are generated in donor: acceptor blends that are used in organic solar cells, and which are generally comprised of a complex phase morphology, where intermixed and neat phases of the donor and acceptor material co-exist. Here we resolve this question, basing our conclusions on Stark effect spectroscopy data obtained in the absence and presence of externally applied electric fields. Reconciling opposing views found in literature, we unambiguously demonstrate that the fate of photogenerated electron-hole pairs-whether they will dissociate to free charges or geminately recombine-is determined at ultrafast times, despite the fact that their actual spatial separation can be much slower. Our insights are important to further develop rational approaches towards material design and processing of organic solar cells, assisting to realize their purported promise as lead-free, third-generation energy technology that can reach efficiencies over 10%.

引用

页数：10

共 59 条

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