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Orbital gap predictions for rational design of organic photovoltaic materials

机译:有机光伏材料合理设计的轨道间隙预测

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摘要

Ionization potentials (IP) and electron affinities (EA) of organic molecules with applications in photovoltaic devices are calculated using modern density functional theory (DFT). Calculated frontier orbital energies are compared to experimentally determined IPs and EAs at gas phase and thin film environments. Gas phase frontier orbital energies calculated with widely-used DFT functionals accidentally coincide with thin film measurements, reproducing condensed phase results for the wrong reasons. Recently developed range separated hybrid (RSH) functionals, on the other hand, provide gas phase frontier orbital energies that correspond properly to measured IPs and EAs. We also employ a polarizable continuum model to address the effects of the electrostatic environment in the solid state. We find that the environmentally-corrected RSH orbital energies compare well with thin film experimental measurements.
机译:使用现代密度泛函理论(DFT)计算有机分子在光伏器件中的电离势(IP)和电子亲和力(EA)。在气相和薄膜环境下,将计算出的前沿轨道能量与实验确定的IP和EA进行比较。用广泛使用的DFT函数计算的气相前沿轨道能量偶然与薄膜测量结果一致,由于错误的原因而产生了凝聚相结果。另一方面,最近开发的距离分离混合(RSH)功能可提供与测量的IP和EA正确对应的气相前沿轨道能量。我们还采用可极化的连续体模型来解决固态环境中静电环境的影响。我们发现,经环境校正的RSH轨道能量与薄膜实验测量结果相当。

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