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Decoupling Interrelated Parameters for Designing High Performance Thermoelectric Materials
    ×ÜËùÖÜÖªÓÉÓÚÈȵç²ÄÁÏÖÐÈý¸ö²ÎÊýµÄ»¥ÏàñîºÏʹµÃ¶ÔÈȵç²ÄÁϵÄÐÔÄÜZTµÄÓÅ»¯³¤Î²Èȵ磬ÖпƴóлÒã½ÌÊÚ×éÔÚ½üÁ½ÄêÔÚͨ¹ýÈ¥ñîºÏÒÔÌá¸ßÈȵç²ÄÁϵÄZTÖµ·½Ãæ×öÁË»ý¼«Ì½Ë÷£¬ÏÖÔÚACSÖøÃûÆÚ¿¯Accounts of Chemical ResearchÉÏ׫дÁËͨ¹ýÈ¥ñîºÏÒÔÌá¸ßÈȵç²ÄÁϵÄZTÖµµÄ×ÛÊöÎÄÕ£¬Ò²È«Ãæ½éÉÜÁËÆä¿ÎÌâ×éÔÚÕâ·½Ãæ×ö³öµÄÏà¹Ø̽Ë÷£¬ÓÐ×Å»ý¼«µÄÖ¸µ¼ÒâÒ壡
In this Account, we discuss our recently developed strategies to decouple thermoelectric parameters for the synergistic optimization of electrical and thermal transport. We first highlight the phase transition, which is accompanied by an abrupt change of electrical transport, such as with a metal−insulator and semiconductor−superionic conductor transition. This should be a universal and effective strategy to optimize the thermoelectric performance, which takes advantage of modulated electronic
structure and critical scattering across phase transitions to decouple the power factor and thermal conductivity. We propose that solid-solution homojunction nanoplates with disordered lattices are promising thermoelectric materials to meet the ¡°phonon glass electron crystal¡± approach. The formation of a solid solution, coupled with homojunctions, allows for synergistically enhanced thermoelectric properties. This occurs through a significant reduction of thermal conductivity, without the
deterioration of thermopower and electrical conductivity. In addition, we introduce the concept of spin entropy in wide band gap semiconductor nanocrystals, which acts to fully disentangle the otherwise interconnected quantities for synergistically optimized thermoelectric performance. Finally, we discuss a new concept we developed that is based on an ultrathin nanosheet composite that we fabricated from ultrathin nanosheets of atomic thickness. These retain the original strong two-dimensional electron gas (2DEG) and allow for decoupled optimization of the three thermoelectric parameters, which improves thermoelectric performanceAccounts of Chemical ResearchÉÏ¿¯µÇÖпƴóµÄһƪÓйØÈȵçµÄ×ÛÊö£¬ÖµµÃ¹Ø×¢£¡
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