用于光电设备中电荷传输层的原子层状过渡金属二硫化物的合成。

Synthesis of atomically thin transition metal disulfides for charge transport layers in optoelectronic devices.

机构信息

†Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 151-744, Republic of Korea.

‡School of Chemical Engineering and Materials Science, Chung-Ang University, Seoul 156-756, Republic of Korea.

出版信息

ACS Nano. 2015 Apr 28;9(4):4146-55. doi: 10.1021/acsnano.5b01504. Epub 2015 Mar 25.

DOI:10.1021/acsnano.5b01504

PMID:25797593

Abstract

UNLABELLED

Metal sulfides (MeS2) such as MoS2 and WS2 were used as charge transport layers in organic light-emitting diodes (OLEDs) and organic photovoltaic (OPV) cells in order to enhance the stability in air comparing to poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (

PEDOT

PSS). MeS2 layers with a polycrystalline structure were synthesized by a chemical deposition method using uniformly spin-coated (NH4)MoS4 and (NH4)WS4 precursor solutions. The ultraviolet-ozone (UV-O3) treatment on MeS2 leads to the removal of the surface contaminants produced by the transfer process, resulting in a uniform surface and an increase of the work function. The maximum luminance efficiencies of the OLEDs with UV-O3-treated MoS2 and WS2 were 9.44 and 10.82 cd/A, respectively. The power conversion efficiencies of OPV cells based on UV-O3-treated MoS2 and WS2 were 2.96 and 3.08%, respectively. These values correspond to over 95% of those obtained with (

PEDOT

PSS) based devices. Furthermore, OLEDs and OPV cells based on MeS2 showed two to six times longer stability in air compared with

PEDOT

PSS based devices. These results suggest that UV-O3-surface-treated MeS2 could be a promising candidate for a charge transport layer in optoelectronic devices.

摘要

未标记

金属硫化物（MeS2），如 MoS2 和 WS2，被用作有机发光二极管（OLED）和有机光伏（OPV）电池的电荷传输层，以提高在空气中的稳定性，与聚（3,4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）相比。使用均匀旋涂的（NH4）MoS4 和（NH4）WS4 前体溶液，通过化学沉积方法合成具有多晶结构的 MeS2 层。MeS2 上的紫外-臭氧（UV-O3）处理导致转移过程中产生的表面污染物被去除，从而得到均匀的表面和功函数的增加。经过 UV-O3 处理的 MoS2 和 WS2 的 OLED 的最大亮度效率分别为 9.44 和 10.82 cd/A。基于 UV-O3 处理的 MoS2 和 WS2 的 OPV 电池的功率转换效率分别为 2.96%和 3.08%。这些值对应于基于（PEDOT：PSS）的器件的 95%以上。此外，与基于（PEDOT：PSS）的器件相比，基于 MeS2 的 OLED 和 OPV 电池在空气中的稳定性提高了两到六倍。这些结果表明，UV-O3 表面处理的 MeS2 可能是光电设备中电荷传输层的有前途的候选材料。