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Origin of the Mixing Ratio Dependence of Power Conversion Efficiency in Bulk Heterojunction Organic Solar Cells with Low Donor Concentration

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dc.contributor.authorSong, Hyung-Jun-
dc.contributor.authorKim, Jun Young-
dc.contributor.authorLee, Donggu-
dc.contributor.authorSong, Jiyun-
dc.contributor.authorKo, Youngjun-
dc.contributor.authorKwak, Jeonghun-
dc.contributor.authorLee, Changhee-
dc.creator이창희-
dc.date.accessioned2014-02-24T00:26:34Z-
dc.date.available2014-02-24T00:26:34Z-
dc.date.issued2013-12-
dc.identifier.citationJournal of Nanoscience and Nanotechnology Vol.13 No.12, pp. 7982-7987-
dc.identifier.issn1533-4880-
dc.identifier.urihttps://hdl.handle.net/10371/90957-
dc.description.abstractWe studied the origin of the improvement in device performance of thermally evaporated bulk heterojunction organic photovoltaic devices (OPVs) with low donor concentration. Samples with three different donor-acceptor mixing ratios, 0:10 (C70-only), 1:9 (low-doped) and 3:7 (high-doped), were fabricated with 1,1-bis-(4-bis(4-methyl-phenyl)-amino-phenyl)-cyclohexane (TAPC):C70. The power conversion efficiencies (PCEs) of these samples were 1.14%, 2.74% and 0.69%, respectively. To determine why the low-doped device showed a high PCE, we measured various properties of the devices in terms of the effective energy band gap, activation energy, charge carrier mobility and recombination loss. We found that the activation energy for charge carrier transport was increased as we increased the TAPC concentration in the blends whereas the hole and electron mobilities became more balanced as the TAPC concentration was increased. Furthermore, the recombination loss parameter alpha (from the light intensity dependence) remained alpha to approximately 0.9 in the low-doped device, but it decreased to alpha to approximately 0.77 in the high-doped device, indicating a large recombination loss as a result of space charge. Therefore, the improved PCE of low-doped OPVs can be attributed to the balance between carrier mobilities with no increase in recombination loss.-
dc.description.sponsorshipThis work was supported by the Human Resources Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy (No. 20124010203170).-
dc.language.isoenen
dc.publisherAmerican Scientific Publishersen
dc.subject복합학en
dc.subjectOrganic Photovoltaic Cells-
dc.subjectSmall Molecule-
dc.subjectBulk Heterojunction-
dc.subjectDonor–Acceptor Mixing Ratio-
dc.titleOrigin of the Mixing Ratio Dependence of Power Conversion Efficiency in Bulk Heterojunction Organic Solar Cells with Low Donor Concentrationen
dc.typeArticle-
dc.author.alternative송형준-
dc.author.alternative김준영-
dc.author.alternative이동구-
dc.author.alternative송지연-
dc.author.alternative고영준-
dc.author.alternative곽정훈-
dc.author.alternative이창희-
dc.identifier.doi10.1166/jnn.2013.8155-
dc.citation.journaltitleJournal of Nanoscience and Nanotechnology-
dc.description.srndOAIID:oai:osos.snu.ac.kr:snu2013-01/102/0000029430/6-
dc.description.srndSEQ:6-
dc.description.srndPERF_CD:SNU2013-01-
dc.description.srndEVAL_ITEM_CD:102-
dc.description.srndUSER_ID:0000029430-
dc.description.srndADJUST_YN:N-
dc.description.srndEMP_ID:A076109-
dc.description.srndDEPT_CD:430-
dc.description.srndCITE_RATE:1.149-
dc.description.srndFILENAME:journal of nanoscience and nanotechnology 13, 7982 (dec, 2013).pdf-
dc.description.srndDEPT_NM:전기·정보공학부-
dc.description.srndEMAIL:chlee7@snu.ac.kr-
dc.description.srndSCOPUS_YN:Y-
dc.description.srndCONFIRM:Y-
dc.identifier.srnd2013-01/102/0000029430/6-
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