We experimentally investigate the thermoelectric power (Seebeck effect) of quasi-two-dimensional single crystals of titanium and zirconium trichalcogenides (TiS 3 , ZrS 3 , ZrSe 3 , and ZrTe 3 ) under applied high pressure up to 10 GPa. Both sulfides were characterized by n-type semiconducting conduction in the whole pressure range investigated and, generally, showed moderate pressure responses of their electronic properties. Metallic ZrTe 3 conserved its p-type conduction under pressure, and its Seebeck coefficient curve displayed a distinct crossover near 2 GPa. Semiconducting ZrSe 3 demonstrated more remarkable responses to applied pressure, which included a multiorder gradual drop in its electrical resistance value up to 9 GPa and an n−p inversion of the dominant conduction type around 6 GPa. Furthermore, we found that a thermoelectric power factor of ZrSe 3 may be greatly improved under high applied pressure, achieving a value of an order of 3.5 mW/(K 2 m) at 9.5 GPa. Thus, an appropriately strained p-type ZrSe 3 with a dramatically reduced band gap value turns to be a promising thermoelectrics. One can anticipate that ZrSe 3 −ZrTe 3 solid solutions, in which the addition of ZrTe 3 should decrease the band gap value of ZrSe 3 in a controlled manner, could also demonstrate high thermoelectric performance parameters. Reversibility and reproducibility of the pressure-driven changes in the electronic properties of ZrSe 3 suggest that it has a potential for other industrial applications linked to cyclic stress loads, for example, in n−p switches or control of p−n−p transistor elements.

Note: This paper is part of the Special Topic on Topological Materials and Devices.

No abstract

No abstract

Àííîòàöèÿ. Ïðåäñòàâëåíû ðåçóëüòàòû ýêñïåðèìåíòàëüíûõ èññëåäîâàíèé ïî âëèÿíèþ âûñîêèõ äàâëåíèé (12-45 ÃÏà) è íèçêèõ òåìïåðàòóð (10-300 K) íà ýëåêòðè÷åñêèå ñâîéñòâà ïîëóïðîâîäíèêà CuInAsSe 3. Îïðåäåëåíû îáëàñòè òåìïåðàòóð è äàâëåíèé, â êîòîðûõ ïðîèñõîäÿò ñóùåñòâåííûå èçìåíåíèÿ â ïîâåäåíèè ýëåêòðè÷åñêèõ ñâîéñòâ ñîåäèíåíèÿ. Ïðè àòìîñôåðíîì äàâëåíèè íàáëþäàåòñÿ ìàêñèìóì íà òåìïåðàòóðíîé çàâèñèìîñòè äèýëåêòðè÷åñêîé ïðîíèöàåìîñòè â îáëàñòè 160-200 Ê, ÷òî ìîaeåò áûòü ñâÿçàíî ñ ñåãíåòîýëåêòðè÷åñêèì ïåðåõîäîì. Óñòàíîâëåíî, ÷òî ïðè êîìíàòíîé òåìïåðàòóðå ñ óâåëè÷åíèåì äàâëåíèÿ â èíòåðâàëå 34-37 ÃÏà ñîïðîòèâëåíèå ìàòåðèàëà ðåçêî óìåíüøàåòñÿ è ïåðåñòàåò çàâèñåòü îò ÷àñòîòû ïðèëîaeåííîãî íàïðÿaeåíèÿ ïðè äàëüíåéøåì óâåëè÷åíèè äàâëåíèÿ, òàíãåíñ óãëà ïîòåðü áûñòðî âîçðàñòàåò ïîñëå 37 ÃÏà, ÷òî óêàçûâàåò íà âîçìîaeíûå ñòðóêòóðíûå ïðåâðàùåíèÿ è èçìåíåíèå ýëåêòðîííîé ñòðóêòóðû. Ýòè èçìåíåíèÿ ÿâëÿþòñÿ íåîáðàòèìûìè. Ñâîéñòâà ñîåäèíåíèÿ ïîçâîëÿþò âûñêàçàòü ïðåäëîaeåíèÿ ïî èñïîëüçîâàíèþ åãî â êà÷åñòâå ìàòåðèàëà äëÿ äàò÷èêîâ ïî äàâëåíèþ è òåìïåðàòóðå. Êëþ÷åâûå ñëîâà: õàëüêîãåíèäû, ñåãíåòîýëåêòðèêè, ýëåêòðè÷åñêèå ñâîéñòâà, âûñîêèå äàâëåíèÿ, èìïåäàíñíàÿ ñïåêòðîñêîïèÿ ÎÑÎÁËÈÂÎÑÒ² ÅËÅÊÒÐÈ×ÍÈÕ ÂËÀÑÒÈÂÎÑÒÅÉ CuInAsSe 3 ÏÐÈ ÂÈÑÎÊÈÕ ÒÈÑÊÀÕ ÒÀ ÍÈÇÜÊÈÕ ÒÅÌÏÅÐÀÒÓÐÀÕ Í. Â. Ìåëüíèêîâà, Î. Ë. Õåéôåöü, À. Í. Áàáóøê³í, Ê. Â. Êóðî÷êà Àíîòàö³ÿ. Ïðåäñòàâëåíî ðåçóëüòàòè åêñïåðèìåíòàëüíèõ äîñë³äaeåíü ïî âïëèâó âèñîêèõ òèñê³â (12-45 ÃÏà) ³ íèçüêèõ òåìïåðàòóð (10-300 K) íà åëåêòðè÷í³ âëàñòèâîñò³ íàï³âïðî-â³äíèêà CuInAsSe 3. Âèçíà÷åí³ îáëàñò³ òåìïåðàòóð ³ òèñê³â, ó ÿêèõ â³äáóâàþòüñÿ ³ñòîòí³ çì³íè â ïîâîäaeåíí³ åëåêòðè÷íèõ âëàñòèâîñòåé ñïîëóêè. Ïðè àòìîñôåðíîìó òèñêó ñïîñòåð³ãàºòüñÿ ìàêñèìóì íà òåìïåðàòóðí³é çàëåaeíîñò³ ä³åëåêòðè÷íî¿ ïðîíèêíîñò³ â îáëàñò³ 160-200 Ê, ùî ìîaeå áóòè ïîâ'ÿçàíå ³ç ñåãíåòîåëåêòðè÷íèì ïåðåõîäîì. Âñòàíîâëåíî, ùî ïðè ê³ìíàòí³é

No abstract

No abstract

No abstract