Seungki Jo, Hyun-sik Kim, Yurian Kim, Sang‐il Kim, Kyu Hyoung Lee
{"title":"抑制双极传导对n型Cu 0.008Bi 2(Te,Se) 3合金高温热电性能的硒诱导增强","authors":"Seungki Jo, Hyun-sik Kim, Yurian Kim, Sang‐il Kim, Kyu Hyoung Lee","doi":"10.2139/ssrn.3787880","DOIUrl":null,"url":null,"abstract":"Bipolar conduction in Bi-Te-based alloys is a critical barrier to high conversion efficiency in thermoelectric power generation applications. Herein, we investigate the effect of compositional tuning of Te/Se ratio on bipolar conduction in <i>n</i>-type Cu<sub>0.008</sub>Bi<sub>2</sub>(Te,Se)<sub>3</sub> alloys. Based on the two-band model and Callaway model, we found that electronic and thermal transports of minority carriers (holes) were gradually decreased with an increase in Se content. The high-temperature power factor of Se-rich Cu<sub>0.008</sub>Bi<sub>2</sub>Te<sub>2.1</sub>Se<sub>0.9</sub> was higher in value compared to reference Cu<sub>0.008</sub>Bi<sub>2</sub>Te<sub>2.7</sub>Se<sub>0.3</sub> due to the weighted mobility ratio increase, and its bipolar thermal conductivity was significantly reduced simultaneously. As a result, a peak figure of merit (<i>zT</i>) of 0.92 was obtained at 440 K in Cu<sub>0.008</sub>Bi<sub>2</sub>Te<sub>2.1</sub>Se<sub>0.9</sub>.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":"5 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Se-Induced Enhancement of the High-Temperature Thermoelectric Performance of n-type Cu 0.008Bi 2(Te,Se) 3 Alloys Due to Suppressed Bipolar Conduction\",\"authors\":\"Seungki Jo, Hyun-sik Kim, Yurian Kim, Sang‐il Kim, Kyu Hyoung Lee\",\"doi\":\"10.2139/ssrn.3787880\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Bipolar conduction in Bi-Te-based alloys is a critical barrier to high conversion efficiency in thermoelectric power generation applications. Herein, we investigate the effect of compositional tuning of Te/Se ratio on bipolar conduction in <i>n</i>-type Cu<sub>0.008</sub>Bi<sub>2</sub>(Te,Se)<sub>3</sub> alloys. Based on the two-band model and Callaway model, we found that electronic and thermal transports of minority carriers (holes) were gradually decreased with an increase in Se content. The high-temperature power factor of Se-rich Cu<sub>0.008</sub>Bi<sub>2</sub>Te<sub>2.1</sub>Se<sub>0.9</sub> was higher in value compared to reference Cu<sub>0.008</sub>Bi<sub>2</sub>Te<sub>2.7</sub>Se<sub>0.3</sub> due to the weighted mobility ratio increase, and its bipolar thermal conductivity was significantly reduced simultaneously. As a result, a peak figure of merit (<i>zT</i>) of 0.92 was obtained at 440 K in Cu<sub>0.008</sub>Bi<sub>2</sub>Te<sub>2.1</sub>Se<sub>0.9</sub>.\",\"PeriodicalId\":18255,\"journal\":{\"name\":\"MatSciRN: Process & Device Modeling (Topic)\",\"volume\":\"5 1\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2021-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"MatSciRN: Process & Device Modeling (Topic)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.2139/ssrn.3787880\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"MatSciRN: Process & Device Modeling (Topic)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2139/ssrn.3787880","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Se-Induced Enhancement of the High-Temperature Thermoelectric Performance of n-type Cu 0.008Bi 2(Te,Se) 3 Alloys Due to Suppressed Bipolar Conduction
Bipolar conduction in Bi-Te-based alloys is a critical barrier to high conversion efficiency in thermoelectric power generation applications. Herein, we investigate the effect of compositional tuning of Te/Se ratio on bipolar conduction in n-type Cu0.008Bi2(Te,Se)3 alloys. Based on the two-band model and Callaway model, we found that electronic and thermal transports of minority carriers (holes) were gradually decreased with an increase in Se content. The high-temperature power factor of Se-rich Cu0.008Bi2Te2.1Se0.9 was higher in value compared to reference Cu0.008Bi2Te2.7Se0.3 due to the weighted mobility ratio increase, and its bipolar thermal conductivity was significantly reduced simultaneously. As a result, a peak figure of merit (zT) of 0.92 was obtained at 440 K in Cu0.008Bi2Te2.1Se0.9.
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