Direct observation of UV-induced charge accumulation in inverted-type polymer solar cells with a TiOx layer: Microscopic elucidation of the light-soaking phenomenon
The mechanism of light-soaking phenomenon in inverted-type organic solar cells (IOSCs) with a structure of indium-tin-oxide/TiOx/P3HT:PCBM/Au was studied by electron spin resonance (ESR) spectroscopy. Charge accumulation in the cell during UV-light irradiation was observed using ESR, which was clear...
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| Veröffentlicht in: | Applied physics letters 2016-09, Vol.109 (13) |
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| creator | Son, D Kuwabara, T Takahashi, K |
| description | The mechanism of light-soaking phenomenon in inverted-type organic solar cells (IOSCs) with a structure of indium-tin-oxide/TiOx/P3HT:PCBM/Au was studied by electron spin resonance (ESR) spectroscopy. Charge accumulation in the cell during UV-light irradiation was observed using ESR, which was clearly correlated with the light-soaking phenomenon. The origin of the charge accumulation is clarified as holes that are deeply trapped at p-type P3HT polymer-chain ends with bromine after hole transfer from the band excitation in the TiOx layer. The holes are considered to be electrostatically attracted to trapped electrons in the TiOx layer after the band excitation. These accumulated charges are the origin of the light-soaking phenomenon. Our results strongly suggest that passivation of the residual OH groups in the TiOx layer is needed to avoid the light-soaking phenomenon by preventing electron trappings, a step that is indispensable in the operation of highly stable IOSCs without UV-light irradiation based on a low-cost and low-temperature device fabrication process using flexible plastic substrates. |
| doi_str_mv | 10.1063/1.4963285 |
| format | Article |
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Charge accumulation in the cell during UV-light irradiation was observed using ESR, which was clearly correlated with the light-soaking phenomenon. The origin of the charge accumulation is clarified as holes that are deeply trapped at p-type P3HT polymer-chain ends with bromine after hole transfer from the band excitation in the TiOx layer. The holes are considered to be electrostatically attracted to trapped electrons in the TiOx layer after the band excitation. These accumulated charges are the origin of the light-soaking phenomenon. Our results strongly suggest that passivation of the residual OH groups in the TiOx layer is needed to avoid the light-soaking phenomenon by preventing electron trappings, a step that is indispensable in the operation of highly stable IOSCs without UV-light irradiation based on a low-cost and low-temperature device fabrication process using flexible plastic substrates.</description><identifier>ISSN: 0003-6951</identifier><identifier>EISSN: 1077-3118</identifier><identifier>DOI: 10.1063/1.4963285</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Accumulation ; Applied physics ; Bromine ; Electron paramagnetic resonance ; Electron spin ; Excitation ; Indium tin oxides ; Light ; Light irradiation ; Organic chemistry ; Photovoltaic cells ; Polymers ; Soaking ; Solar cells ; Spin resonance ; Substrates ; Titanium oxides ; Ultraviolet radiation</subject><ispartof>Applied physics letters, 2016-09, Vol.109 (13)</ispartof><rights>2016 Author(s). 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Charge accumulation in the cell during UV-light irradiation was observed using ESR, which was clearly correlated with the light-soaking phenomenon. The origin of the charge accumulation is clarified as holes that are deeply trapped at p-type P3HT polymer-chain ends with bromine after hole transfer from the band excitation in the TiOx layer. The holes are considered to be electrostatically attracted to trapped electrons in the TiOx layer after the band excitation. These accumulated charges are the origin of the light-soaking phenomenon. Our results strongly suggest that passivation of the residual OH groups in the TiOx layer is needed to avoid the light-soaking phenomenon by preventing electron trappings, a step that is indispensable in the operation of highly stable IOSCs without UV-light irradiation based on a low-cost and low-temperature device fabrication process using flexible plastic substrates.</description><subject>Accumulation</subject><subject>Applied physics</subject><subject>Bromine</subject><subject>Electron paramagnetic resonance</subject><subject>Electron spin</subject><subject>Excitation</subject><subject>Indium tin oxides</subject><subject>Light</subject><subject>Light irradiation</subject><subject>Organic chemistry</subject><subject>Photovoltaic cells</subject><subject>Polymers</subject><subject>Soaking</subject><subject>Solar cells</subject><subject>Spin resonance</subject><subject>Substrates</subject><subject>Titanium oxides</subject><subject>Ultraviolet radiation</subject><issn>0003-6951</issn><issn>1077-3118</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNo9Tc1OwzAYixBIjMGBN4jEuZDftuOGxq80tMvGdUrSr2tG1pQkHex9eFCKhpBsWbYsG6FLSq4pyfkNvRaTnLNSHqERJUWRcUrLYzQihPAsn0h6is5i3AxWMs5H6PveBjAJex0h7FSyvsW-xsu3zLZVb6DCplFhDVgZ0297d2jYX-wgJKiytO8Ad97ttxBw9E4FbMC5iD9tarDCCzv_wk7tIdziV2uCj8Z31mBwvbHV_2NqADu7blIWvXq37Rp3DbR-O7A9Rye1chEu_nSMlo8Pi-lzNps_vUzvZlnLcpYyKEWlhSpKbkBzogslKgFa1FoQLUspClEWuhoSbag0FVO80JJqwWohSyL5GF0ddrvgP3qIabXxfWiHyxWjjOaUM17wH0h-b8E</recordid><startdate>20160926</startdate><enddate>20160926</enddate><creator>Son, D</creator><creator>Kuwabara, T</creator><creator>Takahashi, K</creator><general>American Institute of Physics</general><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20160926</creationdate><title>Direct observation of UV-induced charge accumulation in inverted-type polymer solar cells with a TiOx layer: Microscopic elucidation of the light-soaking phenomenon</title><author>Son, D ; Kuwabara, T ; Takahashi, K</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-n262t-e84db4a783ceb30b7a4d4eb4fb40b58547487bdeb4bc15cd2a37b51b42f458053</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Accumulation</topic><topic>Applied physics</topic><topic>Bromine</topic><topic>Electron paramagnetic resonance</topic><topic>Electron spin</topic><topic>Excitation</topic><topic>Indium tin oxides</topic><topic>Light</topic><topic>Light irradiation</topic><topic>Organic chemistry</topic><topic>Photovoltaic cells</topic><topic>Polymers</topic><topic>Soaking</topic><topic>Solar cells</topic><topic>Spin resonance</topic><topic>Substrates</topic><topic>Titanium oxides</topic><topic>Ultraviolet radiation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Son, D</creatorcontrib><creatorcontrib>Kuwabara, T</creatorcontrib><creatorcontrib>Takahashi, K</creatorcontrib><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Applied physics letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Son, D</au><au>Kuwabara, T</au><au>Takahashi, K</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Direct observation of UV-induced charge accumulation in inverted-type polymer solar cells with a TiOx layer: Microscopic elucidation of the light-soaking phenomenon</atitle><jtitle>Applied physics letters</jtitle><date>2016-09-26</date><risdate>2016</risdate><volume>109</volume><issue>13</issue><issn>0003-6951</issn><eissn>1077-3118</eissn><abstract>The mechanism of light-soaking phenomenon in inverted-type organic solar cells (IOSCs) with a structure of indium-tin-oxide/TiOx/P3HT:PCBM/Au was studied by electron spin resonance (ESR) spectroscopy. Charge accumulation in the cell during UV-light irradiation was observed using ESR, which was clearly correlated with the light-soaking phenomenon. The origin of the charge accumulation is clarified as holes that are deeply trapped at p-type P3HT polymer-chain ends with bromine after hole transfer from the band excitation in the TiOx layer. The holes are considered to be electrostatically attracted to trapped electrons in the TiOx layer after the band excitation. These accumulated charges are the origin of the light-soaking phenomenon. Our results strongly suggest that passivation of the residual OH groups in the TiOx layer is needed to avoid the light-soaking phenomenon by preventing electron trappings, a step that is indispensable in the operation of highly stable IOSCs without UV-light irradiation based on a low-cost and low-temperature device fabrication process using flexible plastic substrates.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.4963285</doi><oa>free_for_read</oa></addata></record> |
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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Accumulation Applied physics Bromine Electron paramagnetic resonance Electron spin Excitation Indium tin oxides Light Light irradiation Organic chemistry Photovoltaic cells Polymers Soaking Solar cells Spin resonance Substrates Titanium oxides Ultraviolet radiation |
| title | Direct observation of UV-induced charge accumulation in inverted-type polymer solar cells with a TiOx layer: Microscopic elucidation of the light-soaking phenomenon |
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