碳酸铯对PCBM在薄膜中聚集的影响
The Effect of Cesium Carbonate on PCBM Aggregation in Films
摘要：
利用表面压等温线、X射线反射率和X射线近全反射荧光光谱研究了1-（3-甲氧羰基）丙基-1-苯基[6，6]C $_{61}$（PCBM）与碳酸铯预混合后在空气-水界面上成膜的性质。与碳酸铯的预混合的PCBM显示出对膜的组织的显著强的影响。而由纯PCBM溶液形成的膜由于强的分子间相互作用而粗糙，由混合物形成的膜光滑得多。这表明碳酸铯缓和了PCBM分子之间的分子间相互作用，暗示在倒置有机光致发光中观察到的铯扩散和可能随后的离子Cs-PCBM相互作用降低了PCBM的聚集趋势。这意味着铯盐的使用影响了有机层的形态，从而提高了这些器件的效率。
英文摘要：
Surface-pressure isotherms, X-ray reflectivity and X-ray near-total reflection fluorescence were used to study the properties of 1-(3-methoxycarbonyl)propyl-1-phenyl[6,6]C$_{61}$ (PCBM) that was pre-mixed with cesium carbonate and spread as a film at the air-water interface. The pre-mixed PCBM with cesium carbonate demonstrated a strikingly strong effect on the organization of the film. Whereas films formed from pure PCBM solution were rough due to strong inter-molecular interactions, the films formed from the mixture were much smoother. This indicates that the cesium carbonate moderates the inter-molecular interactions among PCBM molecules, hinting that the cesium diffusion observed in inverted organic photovoltaics and the likely ensuing ionic Cs-PCBM interaction decreases aggregation tendency of PCBM. This implies that the use of cesium salts affects the morphology of the organic layer and consequently improves the efficiency of these devices.
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