Two mechanisms of exciton dissociation in rubrene single crystals
Two mechanisms of exciton dissociation in rubrene single crystals
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红荧烯单晶中激子解离的两种机制
DOI：
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发表时间：
2010
期刊：
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通讯作者：
V. Podzorov
中科院分区：
文献类型：
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作者：
H. Najafov;B. Lyu;I. Biaggio;V. Podzorov
红荧烯单晶中的激子通过两种机制解离成自由电荷载流子，这两种机制的相对重要性取决于通过进入晶体的光学穿透深度的照明波长。第一种机制是在光激发后不到10 ns内的缺陷诱导解离。对于低的光激发密度，约10%的激子，幸存的辐射复合解离通过这个通道。第二种机制，影响剩余的90%的激子，涉及先前报道的状态本地化接近晶体的表面，导致延迟释放的光载流子的几分之一毫秒后光激发。
Excitons in rubrene single crystals dissociate into free charge carriers via two mechanisms whose relative importance depends on the illumination wavelength through the optical penetration depth into the crystal. The first mechanism is defect-induced dissociation in less than 10 ns after photoexcitation. For low photoexcitation densities, about 10% of the excitons that survive radiative recombination dissociate through this channel. The second mechanism, affecting the remaining 90% of the excitons, involves a previously reported state localized close to the surface of the crystal that leads to a delayed release of photocarriers a fraction of a millisecond after photoexcitation.