P-Type Polymer-Hybridized High-Performance Piezoelectric Nanogenerators

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• 作者：Keun Young Lee ; Brijesh Kumar ; Ju-Seok Seo ; Kwon-Ho Kim ; Jung Inn Sohn ; Seung Nam Cha ; Dukhyun Choi ; Zhong Lin Wang ; Sang-Woo Kim
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：April 11, 2012
• 年：2012
• 卷：12
• 期：4
• 页码：1959-1964
• 全文大小：430K
• 年卷期：v.12,no.4(April 11, 2012)
• ISSN：1530-6992

文摘

Enhancing the output power of a nanogenerator is essential in applications as a sustainable power source for wireless sensors and microelectronics. We report here a novel approach that greatly enhances piezoelectric power generation by introducing a p-type polymer layer on a piezoelectric semiconducting thin film. Holes at the film surface greatly reduce the piezoelectric potential screening effect caused by free electrons in a piezoelectric semiconducting material. Furthermore, additional carriers from a conducting polymer and a shift in the Fermi level help in increasing the power output. Poly(3-hexylthiophene) (P3HT) was used as a p-type polymer on piezoelectric semiconducting zinc oxide (ZnO) thin film, and phenyl-C₆₁-butyric acid methyl ester (PCBM) was added to P3HT to improve carrier transport. The ZnO/P3HT:PCBM-assembled piezoelectric power generator demonstrated 18-fold enhancement in the output voltage and tripled the current, relative to a power generator with ZnO only at a strain of 0.068%. The overall output power density exceeded 0.88 W/cm³, and the average power conversion efficiency was up to 18%. This high power generation enabled red, green, and blue light-emitting diodes to turn on after only tens of times bending the generator. This approach offers a breakthrough in realizing a high-performance flexible piezoelectric energy harvester for self-powered electronics.

Keywords:

Piezoelectricity; nanogenerator; zinc oxide; polymer; carrier passivation; piezoelectric potential screening effect