The effect of fluorination on the low and high frequency dielectric constants of non-polymeric organic semiconductors – towards homojunction solar cells
作者:Neil Mallo、Shaun McAnally、Ronan Chu、Mohammad Babazadeh、Hui Jin、Paul L. Burn、Ian R. Gentle、Paul E. Shaw
DOI:10.1039/d3tc02740f
日期:——
complex blend morphologies. However, to achieve that goal the organic semiconductor would need to have a dielectric constant of ≈10 such that free charge carriers are formed directly upon photoexcitation. In this study we explore the effect of fluorination on the low and high frequency dielectric constants of two sets of materials with monomeric (A′–A–D) or dimeric (A′–A–D–D–A–A′) structures, where A′ is
在过去的十年中,体异质结有机太阳能电池在功率转换效率和稳定性方面取得了显着的进步。然而,由于效率对形态变化的敏感性,从实验室规模的设备到商业面板的转换变得复杂,这需要对加工条件进行微妙的控制。光吸收层中仅具有单一发色材料的同质结结构可以提供克服与控制复杂混合形态相关的问题的途径。然而,为了实现这一目标,有机半导体需要具有约 10 的介电常数,以便在光激发时直接形成自由载流子。H-环戊[2,1 -b :3,4 -b ']二噻吩 (CPDT) 供体单元。发现氟化对薄膜吸收性能只有很小的影响(小蓝移和降低的系数),但导致薄膜相对于质子化材料密度增加(1.44 g cm -3 与1.32 g cm -3),并且色散不平衡电子(约10 -6 cm 2 V -1 s -1)和空穴传输(约10 -5 cm 2 V -1 s -1 ))。重要的是,虽然氟化二聚材料的低频介电常数大于质子化材料的低频介电常数(8