材料科学
聚苯胺
石墨烯
兴奋剂
纳米技术
量子点
光伏
热电效应
可变距离跳频
电导率
光电子学
偏压
热传导
凝聚态物理
电压
复合材料
聚合物
电气工程
光伏系统
化学
物理
工程类
物理化学
聚合
热力学
作者
Abu Bakar Siddique,K. Morrison,G. Venkat,A K Pramanick,Niladri Banerjee,Mallar Ray
出处
期刊:ACS applied electronic materials
[American Chemical Society]
日期:2021-03-04
卷期号:3 (3): 1437-1446
被引量:10
标识
DOI:10.1021/acsaelm.1c00057
摘要
Nitrogen-functionalized graphene quantum dots embedded in a polyaniline matrix (NGQD–PANI) are extremely promising candidates for the development of next-generation sensors and for thermoelectric materials design with the distinct advantage of tunability of electronic properties by controlled doping and/or by controlling the inherent disorder in the microstructure. While their application is increasing in photovoltaics, energy storage, and sensing technologies, a clear understanding of conduction in these hybrid systems is lacking. Here, we report a comprehensive study of NGQD–PANI composites with varying NGQD doping levels over a wide range of temperature. We show distinct regimes of conduction as a function of temperature, which include: a transition from Efros–Shklovskii and Larkin–Khmelnitskii variable range hopping at low temperatures to thermally driven electron transport at higher temperatures. Importantly, we find a remarkable 50-fold enhancement in conductivity for 10% NGQD-doped samples and tunability of the crossover temperature between different regimes as a function of the applied voltage bias and doping. Our work provides a general framework to understand the interplay of extrinsic parameters like temperature and voltage bias with intrinsic material properties like doping, which drives the electronic properties in these hybrid systems of technological importance.
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