Influence of Surface Polarity on Optoelectronic Properties of PEDOT:PSS/ZnO Hybrid Heterojunctions,Physica Status Solidi (A) - Applications and Materials Science

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Influence of Surface Polarity on Optoelectronic Properties of PEDOT:PSS/ZnO Hybrid Heterojunctions
Physica Status Solidi (A) - Applications and Materials Science Pub Date : 2020-12-29 , DOI: 10.1002/pssa.202000612
Roman Yatskiv ₁ , Jan Grym ₁ , Stanislav Tiagulskyi ₁ , Nikola Bašinová ₁

Affiliation

The influence of polar and nonpolar crystallographic orientations of ZnO substrates on the current transport mechanism in poly(3,4‐ethylenedioxythiophene) poly(4‐styrenesulfonate) (PEDOT:PSS)/ZnO heterojunctions is investigated by DC and AC electrical measurements. It is shown that PEDOT:PSS forms high‐quality rectifying junctions on nonpolar planes of n‐type ZnO substrates, whereas on polar c‐planes, the quality of the junction is affected by the surface polarity, with lower‐quality junctions formed on the O‐polar c‐plane. The lower quality of the junction is attributed to partial degradation of the O‐polar surface caused by the acidic nature of PEDOT:PSS. By the analysis of current–voltage characteristics, it is demonstrated that the recombination‐tunneling mechanism dominates charge transport in the forward direction. An equivalent circuit is proposed to interpret the data obtained by impedance spectroscopy and the parameters of the equivalent circuit are extracted.

中文翻译：

表面极性对PEDOT：PSS / ZnO杂化异质结光电性能的影响

通过直流和交流电测量，研究了ZnO衬底的极性和非极性晶体学取向对聚（3,4-乙烯二氧噻吩）聚（4-苯乙烯磺酸盐）（PEDOT：PSS）/ ZnO异质结中电流传输机制的影响。结果表明，PEDOT：PSS在n型ZnO衬底的非极性平面上形成高质量的整流结，而在极性c平面上，结的质量受表面极性的影响，而低质量的结则形成在表面上。 O极c-飞机。结的质量较低是由于PEDOT：PSS的酸性导致O极性表面的部分降解。通过对电流-电压特性的分析，可以证明重组隧穿机制主导着正向电荷传输。提出了一种等效电路来解释通过阻抗谱获得的数据，并提取出等效电路的参数。

更新日期：2020-12-29

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