Department of Chemical Engineering, Pohang University of Science and Technology , Pohang 790-784, Korea.
ACS Appl Mater Interfaces. 2016 Mar;8(10):6546-53. doi: 10.1021/acsami.5b12023. Epub 2016 Mar 1.
Tailoring charge extraction interfaces in perovskite solar cells (PeSCs) critically determines the photovoltaic performance of PeSCs. Here, we investigated the decoupling of two major determinants of the efficient charge extraction, the charge transport and interfacial charge transfer properties at hole transport layers (HTLs). A simple physical tuning of a representative polymeric HTL, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate), provided a wide range of charge conductivities from 10(-4) to 10(3) S cm(-1) without significant modulations in their energy levels, thereby enabling the decoupling of charge transport and transfer properties at HTLs. The transient photovoltaic response measurement revealed that the facilitation of hole transport through the highly conductive HTL promoted the elongation of charge carrier lifetimes within the PeSCs up to 3 times, leading to enhanced photocurrent extraction and finally 25% higher power conversion efficiency.
在钙钛矿太阳能电池（PeSCs）中，定制电荷提取界面是决定 PeSCs 光伏性能的关键。在这里，我们研究了有效电荷提取的两个主要决定因素（电荷输运和界面电荷转移特性）在空穴传输层（HTLs）中的解耦。通过对代表性聚合物 HTL，聚（3,4-乙二氧基噻吩）：聚（苯乙烯磺酸盐）的简单物理调谐，可以在其能级没有明显调制的情况下提供从 10(-4)到 10(3) S cm(-1)的广泛的电荷电导率，从而实现 HTLs 中电荷输运和转移特性的解耦。瞬态光伏响应测量表明，通过高导电性 HTL 促进空穴输运有助于将 PeSCs 内的电荷载流子寿命延长至 3 倍，从而提高光电流提取，最终将功率转换效率提高 25%。
