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{"title":"NovelnRuthenium Sensitizers with a Phenothiazine Conjugated Bipyridyl Ligandnfor High-Efficiency Dye-Sensitized Solar Cells","authors":"Zhijie She (1452565), Yangyang Cheng (1452571), Luoqiang Zhang (1452574), Xiaoyu Li (154408), Di Wu (23906), Qiang Guo (218747), Jingbo Lan (1452568), Ruilin Wang (1452577), Jingsong You (1397368)","doi":"10.1021/acsami.5b09160.s001","DOIUrl":"https://doi.org/10.1021/acsami.5b09160.s001","url":null,"abstract":"Twonefficient ruthenium sensitizers with a phenothiazine-modified bipyridinenas an ancillary ligand, coded <b>SCZ-1</b> and <b>SCZ-2</b>, have been developed as dyes in dye-sensitized solar cells (DSSCs).nBoth sensitizers exhibit low-energy metal-to-ligand charge transfern(MLCT) bands centered at 539 nm with high molar extinction coefficientsnof 1.77 × 10<sup>4</sup> M<sup>–1</sup> cm<sup>–1</sup> for <b>SCZ-1</b> and 1.66 × 10<sup>4</sup> M<sup>–1</sup> cm<sup>–1</sup> for <b>SCZ-2</b>, which are significantlynhigher than the corresponding value for the reference <b>N719</b> (1.27 × 10<sup>4</sup> M<sup>–1</sup> cm<sup>–1</sup>), indicating that the light-harvesting capacity of ruthenium sensitizersncan be reinforced by introducing phenothiazine moieties into the bipyridinenligand. Under AM 1.5G irradiation (100 mW cm<sup>–2</sup>), <b>SCZ</b>-<b>1</b> and <b>SCZ-2</b> sensitized DSSCndevices show impressive power conversion efficiencies (PCE) up ton10.4% by using of iodide-based electrolytes, which exceeds that of <b>N719</b> (9.9%) under the same conditions. Both of the open circuitnvoltage (<i>V</i><sub>OC</sub>) and fill factor (FF) of <b>SCZ</b>-sensitized solar cells approximate to those of <b>N719</b>-sensitized cell. The relatively higher efficiencies of the <b>SCZ</b>-sensitized cells than that of <b>N719</b>-sensitizedncell come from their higher short-circuit photocurrent density (<i>J</i><sub>SC</sub>), which may be mainly attributed to the highnabsorption coefficient. The absorption spectrum and device efficiencynof <b>SCZ-1</b> are both quite close to those of <b>SCZ-2</b>, suggesting that the difference in alkyl chains on the N atom ofnphenothiazine is not a decisive factor in affecting the photovoltaicnperformance of dyes.","PeriodicalId":522146,"journal":{"name":"Figshare","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147892418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}