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Band-like Charge Photogeneration at a Crystalline Organic Donor/Acceptor Interface

机译：晶体有机供体/受体界面的带状电荷光生作用

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摘要

Organic photovoltaic cells possess desirable practical characteristics, such as the potential for low-cost fabrication on flexible substrates, but they lag behind their inorganic counterparts in performance due in part to fundamental energy loss mechanisms, such as overcoming the charge transfer (CT) state binding energy when photogenerated charge is transferred across the donor/acceptor interface. However, recent work has suggested that crystalline interfaces can reduce this binding energy due to enhanced CT state delocalization. Solar cells based on rubrene and C-60 are investigated as an archetypal system because it allows the degree of crystallinity to be moldulated from a highly disordered to highly ordered system. Using a postdeposition annealing method to transform as-deposited amorphous rubrene thin films into ones that are highly crystalline, it is shown that the CT state of a highly crystalline rubrene/C-60 heterojunction undergoes extreme delocalization parallel to the interface leading to a band-like state that exhibits a linear Stark effect. This state parallels the direct charge formation of inorganic solar cells and reduces energetic losses by 220 meV compared with 12 other archetypal heterojunctions reported in the literature.
机译：有机光伏电池具有理想的实用特性，例如在柔性基板上进行低成本制造的潜力，但由于部分基本的能量损耗机制（例如克服了电荷转移（CT）状态结合），其性能落后于无机同类产品当光生电荷跨过供体/受体界面转移时的能量。但是，最近的工作表明，由于增强的CT状态离域，晶体界面可以降低这种结合能。基于红荧烯和C-60的太阳能电池已作为原型系统进行了研究，因为它允许将结晶度从高度无序转变为高度有序的系统。使用沉积后退火方法将沉积的非晶态红荧烯薄膜转变为高度结晶的薄膜，结果表明，高度结晶的红荧烯/ C-60异质结的CT态平行于界面发生极端离域化，从而形成能带表现出线性斯塔克效应的状态。与文献中报道的其他12种原型异质结相比，该状态与无机太阳能电池的直接电荷形成平行，并且将能量损失降低了220 meV。

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