基于有机半导体器件的热-电、光-电转换的集成研究

Thermoelectric and photoelectric processes are two important energy renewable technologies, which can effectively convert and utilize heat and solar energy to electrical power. Until now, the two technologies have separately achieved considerable progress at home and abroad, while they are also facing with some challenging bottlenecks. The bottleneck problem of thermoelectric process is how to achieve an independent control for the inherently interrelated thermal and electric conductivity, in order to maximize its value of ZT (thermoelectric figure of merit). The bottleneck problem of photoelectric process is how to increase the light-induced excited state formation yield as well as how to increase the charge separation. Therefore, this project intends to set a new theoretical model for the integration of thermoelectric and photoelectric conversion from three aspects: the energy levels control and molecular interface design, the performance of thermoelectric process at light-induced excitation state, and the performance of photoelectric process under thermal radiation. To set the theoretical model, we will effectively integrate the thermoelectric and photoelectric conversion by utilizing the excited state, measure the basic parameters, and take the method of photocurrent magnetic field effect and light-induced dielectric response technology. The theoretical model can provide new ideas and mechanism for solving bottlenecks of thermoelectric and photoelectric process, and lay a solid foundation for the development of multi-function and high efficiency organic renewable energy materials.

热-电转换和光-电转换是两个重要的能源再生技术，通过这两个技术可以有效地实现热能和太阳能到电能的转换利用。到目前为止，国内外在这两个独立的技术领域均取得了较大进展，同时也面临着极具挑战的瓶颈问题。热-电转换的瓶颈问题表现在：如何实现对具有内在相互关联的热导和电导进行独立调控，从而大幅度的优化热-电转换ZT值；光-电转换的关键问题是：如何增加光诱导激发态的形成产率，增加电荷的分离,同时减小光-电转化中的热损耗。因此，本项目拟从分子界面调控和能级设计，光诱导下的热-电转换性能和热辐射下的光-电转换性能等三个方面，利用激发态对热-电、光-电转换进行有效的集成，同时通过对其基本参数的测量，辅助光电流磁场效应、光诱导介电响应技术等方法，建立光-电和热-电转换集成的理论模型，为解决光-电和热-电转换中瓶颈问题提供了新的思路和机理，为发展多功能、高效率有机再生能源材料打下坚实的基础。

热—电转换和光—电转换是两个重要的能源再生技术，通过这两个技术可以有效的实现热能和太阳能到电能的转换利用。本项目通过依托国家自然科学基金青年项目的资助，从分子界面调控和能级的设计，光诱导激发态时的热—电转换性能研究，以及热辐射下的光—电转换性能研究等三个方面，利用激发态对热—电、光—电转换进行了有效的集成，同时通过对热电器件的基本参数：电导率、塞贝克系数、热导的研究，并辅助光电流磁场效应、光诱导介电响应技术等先进方法，建立光—电转换和热—电转换集成的理论模型和实验手段，研究发现：1） 激发态是一种有效的实验手段，可以有效的集成光电和热电效应；2）增加激发态的密度能够有效的调控电导和塞贝壳系数，达到同时增加电导率和塞贝克系数的目的；3）利用激发态，可以实现同一器件中的光电和热电双重效应。我们的研究结果为解决光—电转换和热—电转换中瓶颈问题提供了新的思路和机理，为发展多功能、高效率有机再生能源材料打下坚实的基础。