Transparent and flexible organic semiconductor nanofilms with enhanced thermoelectric efficiency

被引:225
作者
Lee, Seung Hwan [1 ]
Park, Hongkwan [1 ]
Kim, Soyeon [1 ]
Son, Woohyun [1 ]
Cheong, In Woo [2 ]
Kim, Jung Hyun [1 ]
机构
[1] Yonsei Univ, Dept Chem & Biomol Engn, Seoul 120749, South Korea
[2] Kyungpook Natl Univ, Dept Appl Chem, Taegu 702701, South Korea
基金
新加坡国家研究基金会;
关键词
ELECTRICAL-CONDUCTIVITY; ENERGY; POLY(3,4-ETHYLENEDIOXYTHIOPHENE); PERFORMANCE; PEDOT; FILMS; DEVICE; LAYERS; POWER; RAMAN;
D O I
10.1039/c4ta00700j
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Sequential doping and dedoping increased the conductivity and optimized the oxidation level of transparent and flexible poly(3,4-ethylenedioxythiophene): poly(4-styrene sulfonic acid) (PEDOT: PSS) films, resulting in an improvement in the thermoelectric figure of merit ZT. The electrical conductivity (sigma) increased from 970 to 1260 S cm(-1) and the power factor from 66.5 to 70.7 mu W mK(-2) at the optimum concentration of the chemical dopant p-toluenesulfonic acid monohydrate (TSA). Then, the doped PEDOT: PSS films were treated with hydrazine/DMSO solutions with different hydrazine concentrations to precisely control the oxidation level. During the hydrazine/DMSO treatment (dedoping), s of the films continuously decreased from 1647 to 783 S cm(-1) due to a decrease in the carrier concentration, whereas the Seebeck coefficient (S) steeply increased from 28 to 49.3 mu V K-1 at the optimum oxidation level. A power factor of 318.4 mu W mK(-2) (sigma = 1310 S cm(-1), S = 49.3 mu V K-1), the highest among all existing thermoelectric nanofilms, was achieved while maintaining polymer film flexibility and transparency (88.3% of optical transmittance). In addition, the thermal conductivity (kappa) of the PEDOT: PSS films decreased from 0.38 to 0.30 W mK(-1) upon removal of PSS. At the lowest kappa value, a high ZT value of 0.31 was achieved at room temperature.
引用
收藏
页码:7288 / 7294
页数:7
相关论文
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