The thermoelectric performance of poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) films are optimized by dimethyl sulfoxide (DMSO) vapor post-treatment on the basis of DMSO addition in PEDOT:PSS solution. Compared with pristine films, the electrical conductivity of PEDOT:PSS with 5% DMSO films is increased by two orders of magnitude. When the PEDOT:PSS with 5% DMSO films are subjected to DMSO vapor post-treatment, the electrical conductivity and Seebeck coefficient are further enhanced. As a result, the power factor of 60 min treated PEDOT:PSS with 5% DMSO films is twice larger than the one without DMSO vapor treatment. Microscopical investigations reveal the morphological evolution of the DMSO vapor treated films. After certain of treating time, quite even and uniformed film morphology is developed, which indicates that film micro-structural order is improved. Through the study of carrier concentration by optical absorption spectra and XPS, it is confirmed that the improvements of thermoelectric performances are attributed to the enhancement of carrier mobility.

聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）薄膜的热电性能是通过在PEDOT：PSS溶液中添加DMSO的二甲基亚砜（DMSO）蒸汽后处理来优化的。与原始膜相比，含5％DMSO膜的PEDOT：PSS的电导率提高了两个数量级。当对具有5％DMSO膜的PEDOT：PSS进行DMSO蒸气后处理时，电导率和塞贝克系数将进一步提高。结果，使用5％DMSO膜处理60分钟的PEDOT：PSS的功率因数是未使用DMSO蒸汽处理的功率因数的两倍。显微镜研究揭示了DMSO蒸气处理的膜的形态演变。经过一定的处理时间，形成了相当均匀的薄膜形态，这表明薄膜的微观结构秩序得到改善。通过利用光吸收光谱和XPS研究载流子浓度，证实了热电性能的提高归因于载流子迁移率的提高。