Influence of crystallinity and energetics on charge separation in polymer-inorganic nanocomposite films for solar cells.
Influence of crystallinity and energetics on charge separation in polymer-inorganic nanocomposite films for solar cells.
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DOI：
10.1038/srep01531
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发表时间：
2013
影响因子：
4.6
通讯作者：
Haque, Saif A.
中科院分区：
文献类型：
--
作者：
Bansal, Neha;Reynolds, Luke X.;MacLachlan, Andrew;Lutz, Thierry;Ashraf, Raja Shahid;Zhang, Weimin;Nielsen, Christian B.;McCulloch, Iain;Rebois, Dylan G.;Kirchartz, Thomas;Hill, Michael S.;Molloy, Kieran C.;Nelson, Jenny;Haque, Saif A.
光生激子的解离和随后的电荷的空间分离对于高效的供体-受体异质结太阳能电池的设计至关重要。虽然在理解全有机结的电荷产生方面取得了巨大进展，但混合有机：无机系统中的过程几乎没有得到解决。在这里，我们探讨的影响，充满活力的驱动力和本地结晶的混合有机：无机半导体异质结的电荷对产生的效率。我们使用X射线衍射，光致发光猝灭，瞬态吸收光谱，光伏器件和电致发光测量证明，在混合异质结的光生极化子对的解离是由晶体电子受体域的存在下协助。我们建议，这样的领域鼓励离域的双生对状态。本研究结果表明，当使用更结晶的电子受体时，放松了对用于电荷分离的大驱动能量的要求。
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.
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