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Effect of Side Substituents Incorporated into π‐Bridges of Quinoxaline‐Based Sensitizers for Dye‐Sensitized Solar Cells
Energy Technology ( IF 3.6 ) Pub Date : 2020-03-18 , DOI: 10.1002/ente.202000032
Wen Zhang 1 , Xichuan Yang 1 , Jincheng An 1 , Li Zhang 1 , Bin Cai 1 , Kaiyuan Yang 1
Affiliation  

Two new metal‐free donor (D)–acceptor (A)–π–A‐type sensitizers with 2,3‐dihexylquinoxaline (HQ) and 2,3‐diphenylquinoxaline (PQ) moieties as additional acceptors, respectively, coded as ZW002 and ZW003, are synthesized and applied in dye‐sensitized solar cells (DSSCs). Both dyes have broad absorption and large molar absorption coefficients. The sensitizer with the HQ core effectively restrains intermolecular aggregation due to steric hindrance of numerous alkyl chains. A thienyl unit with or without a hexyl branch is used as a π‐bridge. Incorporation of only thienyl groups as a π‐bridge into the sensitizer increases the dye‐loading amount on the TiO2 film due to the smaller molecular size. Using the ZW002 dye with the Co (II/III) redox couple results in DSSCs that exhibit a high photovoltaic conversion efficiency of 8.23% and short‐circuit current density (Jsc) of 12.43 mA cm−2, an open‐circuit voltage (Voc) of 960 mV, and a fill factor (FF) of 0.69. Although ZW003 shows a wider absorption range than that of ZW002, the two additional phenyl groups on the quinoxaline unit contribute to poorer performance (power conversion efficiency [PCE] of 7.43%) due to more serious dye aggregation.

中文翻译:

掺入喹喔啉基增敏剂π桥对染料敏化太阳能电池的影响

两种新的不含金属的供体(D)-受体(A)-π-A型敏化剂,分别带有2,3-二己基喹喔啉(HQ)和2,3-二苯基喹喔啉(PQ)部分作为附加受体,编码为ZW002ZW003是合成的,并用于染料敏化太阳能电池(DSSC)。两种染料均具有较宽的吸收率和较大的摩尔吸收系数。具有HQ核心的敏化剂可有效抑制分子间聚集,这是由于许多烷基链的位阻所致。带有或不带有己基支链的噻吩单元被用作π桥。仅将噻吩基作为π桥掺入敏化剂中会增加TiO 2上的染料负载量薄膜由于分子尺寸较小。将ZW002染料与Co(II / III)氧化还原对一起使用会导致DSSC表现出8.23%的高光电转换效率和12.43 mA cm -2的短路电流密度(J sc),开路电压(V oc)为960 mV,填充因子(FF)为0.69。尽管ZW003的吸收范围比ZW002的吸收范围,但由于更严重的染料聚集,喹喔啉单元上的两个附加苯基会导致性能较差(功率转换效率[PCE]为7.43%)。
更新日期:2020-03-18
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