Dielectric functions of Cu2ZnSnSe4 and Cu2SnSe3 semiconductors
The dielectric functions of co-evaporated Cu2ZnSnSe4 (CZTSe) and Cu2SnSe3 (CTSe) polycrystalline layers are determined accurately from self-consistent spectroscopic ellipsometry analyses. To minimize the effects of the compositional modulation and light scattering induced by rough surfaces, quite th...
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| Veröffentlicht in: | Journal of applied physics 2015-01, Vol.117 (1) |
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| container_title | Journal of applied physics |
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| creator | Hirate, Yoshiki Tampo, Hitoshi Minoura, Shota Kadowaki, Hideyuki Nakane, Akihiro Kim, Kang Min Shibata, Hajime Niki, Shigeru Fujiwara, Hiroyuki |
| description | The dielectric functions of co-evaporated Cu2ZnSnSe4 (CZTSe) and Cu2SnSe3 (CTSe) polycrystalline layers are determined accurately from self-consistent spectroscopic ellipsometry analyses. To minimize the effects of the compositional modulation and light scattering induced by rough surfaces, quite thin CZTSe and CTSe layers ( |
| doi_str_mv | 10.1063/1.4905285 |
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To minimize the effects of the compositional modulation and light scattering induced by rough surfaces, quite thin CZTSe and CTSe layers (<50 nm) having the single-phase stoichiometric compositions are characterized. The dielectric functions of CZTSe and CTSe show rather similar spectral features with almost identical critical point energies for the transition peaks at 2.4 and 3.9 eV. The CTSe dielectric function, however, indicates strong free carrier absorption, expressed by the Drude model, due to high p-type conductivity in the layer. We find that CZTSe and CTSe show quite large absorption coefficients exceeding 105 cm−1 at 2.0 eV with band gap values of 0.91 ± 0.02 eV and 0.68 ± 0.05 eV, respectively. To characterize the optical transition in CZTSe in more detail, the dielectric response of each interband transition is calculated by applying density functional theory. The calculation result reveals that the strong visible light absorption in CZTSe is induced by the high joint density of states at the P point in the Brillouin zone. The optical constants of CZTSe and CTSe deduced in this study are further parameterized in an energy range up to 6.0 eV by expressing the transition peaks using the Tauc-Lorentz model. From the above results, we discuss the fundamental optical properties of (Cu,Se)-based compound semiconductors.</description><identifier>ISSN: 0021-8979</identifier><identifier>EISSN: 1089-7550</identifier><identifier>DOI: 10.1063/1.4905285</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Absorptivity ; Brillouin zones ; Copper ; Copper zinc tin selenide ; Critical point ; Density functional theory ; Dielectric strength ; Electromagnetic absorption ; Light scattering ; Mathematical models ; Optical properties ; Optical transition ; Semiconductors ; Spectroellipsometry ; Thin films</subject><ispartof>Journal of applied physics, 2015-01, Vol.117 (1)</ispartof><rights>2015 AIP Publishing LLC.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c323t-64c6dbf3901c48902d9d8efa719bd0c601ae4891e3b69881b316f306119f326a3</citedby><cites>FETCH-LOGICAL-c323t-64c6dbf3901c48902d9d8efa719bd0c601ae4891e3b69881b316f306119f326a3</cites><orcidid>0000-0002-7605-0018</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27923,27924</link.rule.ids></links><search><creatorcontrib>Hirate, Yoshiki</creatorcontrib><creatorcontrib>Tampo, Hitoshi</creatorcontrib><creatorcontrib>Minoura, Shota</creatorcontrib><creatorcontrib>Kadowaki, Hideyuki</creatorcontrib><creatorcontrib>Nakane, Akihiro</creatorcontrib><creatorcontrib>Kim, Kang Min</creatorcontrib><creatorcontrib>Shibata, Hajime</creatorcontrib><creatorcontrib>Niki, Shigeru</creatorcontrib><creatorcontrib>Fujiwara, Hiroyuki</creatorcontrib><title>Dielectric functions of Cu2ZnSnSe4 and Cu2SnSe3 semiconductors</title><title>Journal of applied physics</title><description>The dielectric functions of co-evaporated Cu2ZnSnSe4 (CZTSe) and Cu2SnSe3 (CTSe) polycrystalline layers are determined accurately from self-consistent spectroscopic ellipsometry analyses. To minimize the effects of the compositional modulation and light scattering induced by rough surfaces, quite thin CZTSe and CTSe layers (<50 nm) having the single-phase stoichiometric compositions are characterized. The dielectric functions of CZTSe and CTSe show rather similar spectral features with almost identical critical point energies for the transition peaks at 2.4 and 3.9 eV. The CTSe dielectric function, however, indicates strong free carrier absorption, expressed by the Drude model, due to high p-type conductivity in the layer. We find that CZTSe and CTSe show quite large absorption coefficients exceeding 105 cm−1 at 2.0 eV with band gap values of 0.91 ± 0.02 eV and 0.68 ± 0.05 eV, respectively. To characterize the optical transition in CZTSe in more detail, the dielectric response of each interband transition is calculated by applying density functional theory. The calculation result reveals that the strong visible light absorption in CZTSe is induced by the high joint density of states at the P point in the Brillouin zone. The optical constants of CZTSe and CTSe deduced in this study are further parameterized in an energy range up to 6.0 eV by expressing the transition peaks using the Tauc-Lorentz model. From the above results, we discuss the fundamental optical properties of (Cu,Se)-based compound semiconductors.</description><subject>Absorptivity</subject><subject>Brillouin zones</subject><subject>Copper</subject><subject>Copper zinc tin selenide</subject><subject>Critical point</subject><subject>Density functional theory</subject><subject>Dielectric strength</subject><subject>Electromagnetic absorption</subject><subject>Light scattering</subject><subject>Mathematical models</subject><subject>Optical properties</subject><subject>Optical transition</subject><subject>Semiconductors</subject><subject>Spectroellipsometry</subject><subject>Thin films</subject><issn>0021-8979</issn><issn>1089-7550</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNotkE1LxDAYhIMoWFcP_oOCJw9d3zdJ0-QiSP2EBQ-rFy8hTRPospusSXvw37tl9zTM8DADQ8gtwhJBsAdccgU1lfUZKRCkqpq6hnNSAFCspGrUJbnKeQOAKJkqyOPz4LbOjmmwpZ-CHYcYchl92U70J6zD2vHShH62s2FldrvBxtBPdowpX5MLb7bZ3Zx0Qb5fX77a92r1-fbRPq0qyygbK8Gt6DvPFKDlUgHtVS-dNw2qrgcrAI075OhYJ5SU2DEUnoFAVJ5RYdiC3B179yn-Ti6PehOnFA6TmiLlijdU4oG6P1I2xZyT83qfhp1JfxpBz_do1Kd72D9761ST</recordid><startdate>20150107</startdate><enddate>20150107</enddate><creator>Hirate, Yoshiki</creator><creator>Tampo, Hitoshi</creator><creator>Minoura, Shota</creator><creator>Kadowaki, Hideyuki</creator><creator>Nakane, Akihiro</creator><creator>Kim, Kang Min</creator><creator>Shibata, Hajime</creator><creator>Niki, Shigeru</creator><creator>Fujiwara, Hiroyuki</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0002-7605-0018</orcidid></search><sort><creationdate>20150107</creationdate><title>Dielectric functions of Cu2ZnSnSe4 and Cu2SnSe3 semiconductors</title><author>Hirate, Yoshiki ; Tampo, Hitoshi ; Minoura, Shota ; Kadowaki, Hideyuki ; Nakane, Akihiro ; Kim, Kang Min ; Shibata, Hajime ; Niki, Shigeru ; Fujiwara, Hiroyuki</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c323t-64c6dbf3901c48902d9d8efa719bd0c601ae4891e3b69881b316f306119f326a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>Absorptivity</topic><topic>Brillouin zones</topic><topic>Copper</topic><topic>Copper zinc tin selenide</topic><topic>Critical point</topic><topic>Density functional theory</topic><topic>Dielectric strength</topic><topic>Electromagnetic absorption</topic><topic>Light scattering</topic><topic>Mathematical models</topic><topic>Optical properties</topic><topic>Optical transition</topic><topic>Semiconductors</topic><topic>Spectroellipsometry</topic><topic>Thin films</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hirate, Yoshiki</creatorcontrib><creatorcontrib>Tampo, Hitoshi</creatorcontrib><creatorcontrib>Minoura, Shota</creatorcontrib><creatorcontrib>Kadowaki, Hideyuki</creatorcontrib><creatorcontrib>Nakane, Akihiro</creatorcontrib><creatorcontrib>Kim, Kang Min</creatorcontrib><creatorcontrib>Shibata, Hajime</creatorcontrib><creatorcontrib>Niki, Shigeru</creatorcontrib><creatorcontrib>Fujiwara, Hiroyuki</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of applied physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hirate, Yoshiki</au><au>Tampo, Hitoshi</au><au>Minoura, Shota</au><au>Kadowaki, Hideyuki</au><au>Nakane, Akihiro</au><au>Kim, Kang Min</au><au>Shibata, Hajime</au><au>Niki, Shigeru</au><au>Fujiwara, Hiroyuki</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Dielectric functions of Cu2ZnSnSe4 and Cu2SnSe3 semiconductors</atitle><jtitle>Journal of applied physics</jtitle><date>2015-01-07</date><risdate>2015</risdate><volume>117</volume><issue>1</issue><issn>0021-8979</issn><eissn>1089-7550</eissn><abstract>The dielectric functions of co-evaporated Cu2ZnSnSe4 (CZTSe) and Cu2SnSe3 (CTSe) polycrystalline layers are determined accurately from self-consistent spectroscopic ellipsometry analyses. To minimize the effects of the compositional modulation and light scattering induced by rough surfaces, quite thin CZTSe and CTSe layers (<50 nm) having the single-phase stoichiometric compositions are characterized. The dielectric functions of CZTSe and CTSe show rather similar spectral features with almost identical critical point energies for the transition peaks at 2.4 and 3.9 eV. The CTSe dielectric function, however, indicates strong free carrier absorption, expressed by the Drude model, due to high p-type conductivity in the layer. We find that CZTSe and CTSe show quite large absorption coefficients exceeding 105 cm−1 at 2.0 eV with band gap values of 0.91 ± 0.02 eV and 0.68 ± 0.05 eV, respectively. To characterize the optical transition in CZTSe in more detail, the dielectric response of each interband transition is calculated by applying density functional theory. The calculation result reveals that the strong visible light absorption in CZTSe is induced by the high joint density of states at the P point in the Brillouin zone. The optical constants of CZTSe and CTSe deduced in this study are further parameterized in an energy range up to 6.0 eV by expressing the transition peaks using the Tauc-Lorentz model. From the above results, we discuss the fundamental optical properties of (Cu,Se)-based compound semiconductors.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.4905285</doi><orcidid>https://orcid.org/0000-0002-7605-0018</orcidid></addata></record> |
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| subjects | Absorptivity Brillouin zones Copper Copper zinc tin selenide Critical point Density functional theory Dielectric strength Electromagnetic absorption Light scattering Mathematical models Optical properties Optical transition Semiconductors Spectroellipsometry Thin films |
| title | Dielectric functions of Cu2ZnSnSe4 and Cu2SnSe3 semiconductors |
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