Influence of Crystallinity and Energetics on Charge Separation in Polymer-Inorganic Nanocomposite Films for Solar Cells

被引：81

作者：

Bansal, Neha ^{[1
,2
]}

Reynolds, Luke X. ^{[1
,2
]}

MacLachlan, Andrew ^{[1
,2
]}

Lutz, Thierry ^{[1
,2
]}

Ashraf, Raja Shahid ^{[1
,2
]}

Zhang, Weimin ^{[1
,2
]}

Nielsen, Christian B. ^{[1
,2
]}

McCulloch, Iain ^{[1
,2
]}

Rebois, Dylan G. ^{[3
]}

Kirchartz, Thomas ^{[3
]}

Hill, Michael S. ^{[4
]}

Molloy, Kieran C. ^{[4
]}

Nelson, Jenny ^{[3
]}

Haque, Saif A. ^{[1
,2
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Ctr Plast Elect, London SW7 2AZ, England

[2] Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England

[3] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2AZ, England

[4] Univ Bath, Dept Chem, Bath BA2 7AY, Avon, England

来源：

SCIENTIFIC REPORTS | 2013年 / 3卷

基金：

英国工程与自然科学研究理事会;

关键词：

TRANSFER STATE; QUANTUM DOTS; EFFICIENCY; ENERGY; PHOTOGENERATION; DISSOCIATION; DEPENDENCE; GROWTH; DONOR;

D O I：

10.1038/srep01531

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：

The dissociation of photogenerated excitons and the subsequent spatial separation of the charges are of crucial importance to the design of efficient donor-acceptor heterojunction solar cells. While huge progress has been made in understanding charge generation at all-organic junctions, the process in hybrid organic: inorganic systems has barely been addressed. Here, we explore the influence of energetic driving force and local crystallinity on the efficiency of charge pair generation at hybrid organic: inorganic semiconductor heterojunctions. We use x-ray diffraction, photoluminescence quenching, transient absorption spectroscopy, photovoltaic device and electroluminescence measurements to demonstrate that the dissociation of photogenerated polaron pairs at hybrid heterojunctions is assisted by the presence of crystalline electron acceptor domains. We propose that such domains encourage delocalization of the geminate pair state. The present findings suggest that the requirement for a large driving energy for charge separation is relaxed when a more crystalline electron acceptor is used.

引用

页数：8

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