Hot carrier transfer processes in nonstoichiometric titanium hydride
The absorber of the hot carrier solar cell (HCSC) needs to have a considerably reduced hot carrier thermalisation rate, in order to maintain the photo-generated hot carriers for enough time such that they can be extracted. The slow carrier cooling effect is predicted in materials in which the phonon...
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| Veröffentlicht in: | Japanese Journal of Applied Physics 2017-08, Vol.56 (8S2), p.8 |
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| container_issue | 8S2 |
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| container_title | Japanese Journal of Applied Physics |
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| creator | Wang, Pei Iles, Gail N. Mole, Richard A. Yu, Dehong Wen, Xiaoming Aguey-Zinsou, Kondo-Francois Shrestha, Santosh Conibeer, Gavin |
| description | The absorber of the hot carrier solar cell (HCSC) needs to have a considerably reduced hot carrier thermalisation rate, in order to maintain the photo-generated hot carriers for enough time such that they can be extracted. The slow carrier cooling effect is predicted in materials in which the phononic band gap is sufficiently large to block the Klemens decay. Binary compounds with a large mass ratio between the constituent elements are likely to have large phononic band gap. Titanium hydride is one of these binary compounds that has the potential to become an absorber of the HCSC. Whilst a large phononic gap has been observed in stoichiometric TiH2, it has not been experimentally confirmed for hydrogen deficient TiHx (where x < 2). In this article, we report the phonon density of states of TiH1.65 measured using inelastic neutron scattering and presented to clearly show the phononic band gap. We also present the carrier thermalisation process of a TiHx (1< x |
| doi_str_mv | 10.7567/JJAP.56.08MA10 |
| format | Article |
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The slow carrier cooling effect is predicted in materials in which the phononic band gap is sufficiently large to block the Klemens decay. Binary compounds with a large mass ratio between the constituent elements are likely to have large phononic band gap. Titanium hydride is one of these binary compounds that has the potential to become an absorber of the HCSC. Whilst a large phononic gap has been observed in stoichiometric TiH2, it has not been experimentally confirmed for hydrogen deficient TiHx (where x < 2). In this article, we report the phonon density of states of TiH1.65 measured using inelastic neutron scattering and presented to clearly show the phononic band gap. We also present the carrier thermalisation process of a TiHx (1< x <2) thin film by transient absorption, and estimate the carrier cooling time in this material.</description><identifier>ISSN: 0021-4922</identifier><identifier>EISSN: 1347-4065</identifier><identifier>DOI: 10.7567/JJAP.56.08MA10</identifier><identifier>CODEN: JJAPB6</identifier><language>eng</language><publisher>Tokyo: The Japan Society of Applied Physics</publisher><subject>Absorbers ; Band gap ; Cooling effects ; Inelastic scattering ; Metal hydrides ; Neutron scattering ; Titanium compounds</subject><ispartof>Japanese Journal of Applied Physics, 2017-08, Vol.56 (8S2), p.8</ispartof><rights>2017 The Japan Society of Applied Physics</rights><rights>Copyright Japanese Journal of Applied Physics Aug 2017</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c403t-86ca696136b089674ea615c48fb4f255bc8b36fcee64740c3a8addf050fcb74a3</citedby><cites>FETCH-LOGICAL-c403t-86ca696136b089674ea615c48fb4f255bc8b36fcee64740c3a8addf050fcb74a3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.7567/JJAP.56.08MA10/pdf$$EPDF$$P50$$Giop$$H</linktopdf><link.rule.ids>314,776,780,27901,27902,53821,53868</link.rule.ids></links><search><creatorcontrib>Wang, Pei</creatorcontrib><creatorcontrib>Iles, Gail N.</creatorcontrib><creatorcontrib>Mole, Richard A.</creatorcontrib><creatorcontrib>Yu, Dehong</creatorcontrib><creatorcontrib>Wen, Xiaoming</creatorcontrib><creatorcontrib>Aguey-Zinsou, Kondo-Francois</creatorcontrib><creatorcontrib>Shrestha, Santosh</creatorcontrib><creatorcontrib>Conibeer, Gavin</creatorcontrib><title>Hot carrier transfer processes in nonstoichiometric titanium hydride</title><title>Japanese Journal of Applied Physics</title><addtitle>Jpn. J. Appl. Phys</addtitle><description>The absorber of the hot carrier solar cell (HCSC) needs to have a considerably reduced hot carrier thermalisation rate, in order to maintain the photo-generated hot carriers for enough time such that they can be extracted. The slow carrier cooling effect is predicted in materials in which the phononic band gap is sufficiently large to block the Klemens decay. Binary compounds with a large mass ratio between the constituent elements are likely to have large phononic band gap. Titanium hydride is one of these binary compounds that has the potential to become an absorber of the HCSC. Whilst a large phononic gap has been observed in stoichiometric TiH2, it has not been experimentally confirmed for hydrogen deficient TiHx (where x < 2). In this article, we report the phonon density of states of TiH1.65 measured using inelastic neutron scattering and presented to clearly show the phononic band gap. We also present the carrier thermalisation process of a TiHx (1< x <2) thin film by transient absorption, and estimate the carrier cooling time in this material.</description><subject>Absorbers</subject><subject>Band gap</subject><subject>Cooling effects</subject><subject>Inelastic scattering</subject><subject>Metal hydrides</subject><subject>Neutron scattering</subject><subject>Titanium compounds</subject><issn>0021-4922</issn><issn>1347-4065</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNp1kM1LAzEQxYMoWKtXzwvehF0nm6_tsdSPWioK6jlkswnNYjdrkh7637tlC556mhn4vTePh9AthkIwLh5Wq_lHwXgB1dscwxmaYEJFToGzczQBKHFOZ2V5ia5ibIeTM4on6HHpU6ZVCM6ELAXVRTssffDaxGhi5rqs811M3umN81uTgtNZckl1brfNNvsmuMZcowurfqK5Oc4p-n5--los8_X7y-tivs41BZLyimvFZxwTXkM144IaxTHTtLI1tSVjta5qwq02hlNBQRNVqaaxwMDqWlBFpuhu9B3y_e5MTLL1u9ANL2UJlAgqGMBAFSOlg48xGCv74LYq7CUGeWhKHpqSjMuxqUFwPwqc7_8d21b1B6j6LI-g7Bt7Aj7h_Afi2HgS</recordid><startdate>20170801</startdate><enddate>20170801</enddate><creator>Wang, Pei</creator><creator>Iles, Gail N.</creator><creator>Mole, Richard A.</creator><creator>Yu, Dehong</creator><creator>Wen, Xiaoming</creator><creator>Aguey-Zinsou, Kondo-Francois</creator><creator>Shrestha, Santosh</creator><creator>Conibeer, Gavin</creator><general>The Japan Society of Applied Physics</general><general>Japanese Journal of Applied Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20170801</creationdate><title>Hot carrier transfer processes in nonstoichiometric titanium hydride</title><author>Wang, Pei ; Iles, Gail N. ; Mole, Richard A. ; Yu, Dehong ; Wen, Xiaoming ; Aguey-Zinsou, Kondo-Francois ; Shrestha, Santosh ; Conibeer, Gavin</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c403t-86ca696136b089674ea615c48fb4f255bc8b36fcee64740c3a8addf050fcb74a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Absorbers</topic><topic>Band gap</topic><topic>Cooling effects</topic><topic>Inelastic scattering</topic><topic>Metal hydrides</topic><topic>Neutron scattering</topic><topic>Titanium compounds</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wang, Pei</creatorcontrib><creatorcontrib>Iles, Gail N.</creatorcontrib><creatorcontrib>Mole, Richard A.</creatorcontrib><creatorcontrib>Yu, Dehong</creatorcontrib><creatorcontrib>Wen, Xiaoming</creatorcontrib><creatorcontrib>Aguey-Zinsou, Kondo-Francois</creatorcontrib><creatorcontrib>Shrestha, Santosh</creatorcontrib><creatorcontrib>Conibeer, Gavin</creatorcontrib><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Japanese Journal of Applied Physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wang, Pei</au><au>Iles, Gail N.</au><au>Mole, Richard A.</au><au>Yu, Dehong</au><au>Wen, Xiaoming</au><au>Aguey-Zinsou, Kondo-Francois</au><au>Shrestha, Santosh</au><au>Conibeer, Gavin</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Hot carrier transfer processes in nonstoichiometric titanium hydride</atitle><jtitle>Japanese Journal of Applied Physics</jtitle><addtitle>Jpn. J. Appl. Phys</addtitle><date>2017-08-01</date><risdate>2017</risdate><volume>56</volume><issue>8S2</issue><spage>8</spage><pages>8-</pages><issn>0021-4922</issn><eissn>1347-4065</eissn><coden>JJAPB6</coden><abstract>The absorber of the hot carrier solar cell (HCSC) needs to have a considerably reduced hot carrier thermalisation rate, in order to maintain the photo-generated hot carriers for enough time such that they can be extracted. The slow carrier cooling effect is predicted in materials in which the phononic band gap is sufficiently large to block the Klemens decay. Binary compounds with a large mass ratio between the constituent elements are likely to have large phononic band gap. Titanium hydride is one of these binary compounds that has the potential to become an absorber of the HCSC. Whilst a large phononic gap has been observed in stoichiometric TiH2, it has not been experimentally confirmed for hydrogen deficient TiHx (where x < 2). In this article, we report the phonon density of states of TiH1.65 measured using inelastic neutron scattering and presented to clearly show the phononic band gap. We also present the carrier thermalisation process of a TiHx (1< x <2) thin film by transient absorption, and estimate the carrier cooling time in this material.</abstract><cop>Tokyo</cop><pub>The Japan Society of Applied Physics</pub><doi>10.7567/JJAP.56.08MA10</doi><tpages>7</tpages></addata></record> |
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| ispartof | Japanese Journal of Applied Physics, 2017-08, Vol.56 (8S2), p.8 |
| issn | 0021-4922 1347-4065 |
| language | eng |
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| source | IOP Publishing Journals; Institute of Physics (IOP) Journals - HEAL-Link |
| subjects | Absorbers Band gap Cooling effects Inelastic scattering Metal hydrides Neutron scattering Titanium compounds |
| title | Hot carrier transfer processes in nonstoichiometric titanium hydride |
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