Department of inorganic, organic and biochemistry, Universidad de Castilla - La Mancha, Institute of Nanoscience, Nanotechnology and Molecular Materials (INAMOL), Campus de la Fábrica de Armas, Toledo, Spain.
Department of Physics, Malviya National Institute of Technology, JLN Marg, Jaipur (Raj.), 302017, India.
ChemSusChem. 2021 Sep 6;14(17):3494-3501. doi: 10.1002/cssc.202002664. Epub 2020 Dec 16.
The effect of central donor core on the properties of A-π-D-π-A donors, where D is a porphyrin macrocycle, cyclopenta[2,1-b:3,4-b']dithiophene is the π bridge, and A is a dicyanorhodanine terminal unit, was investigated for the fabrication of the organic solar cells (OSCs), along [6,6]-phenyl-C71-butyric acid methyl ester (PC BM) as electron acceptor. A new molecule consisting of Ni-porphyrin central donor core (VC9) showed deep HOMO energy level and OSCs based on optimized VC9:PC BM realized overall power conversion efficiency (PCE) of 10.66 % [short-circuit current density (J )=15.48 mA/cm , fill factor (FF)=0.65] with high open circuit voltage (V ) of 1.06 V and very low energy loss of 0.49 eV, whereas the Zn-porphyrin analogue VC8:PC BM showed PCE of 9.69 % with V of 0.89 V, J of 16.25 mA/cm and FF of 0.67. Although the OSCs based on VC8 showed higher J in comparison to VC9, originating from the broader absorption profile of VC8 that led to more exciton generation, the higher value of PCE of VC9 is owing to the higher V and reduced energy loss.
研究了以卟啉为中心给体核、苯并[2,1-b:3,4-b']二噻吩为π桥、二氰基罗丹宁为端基单元的 A-π-D-π-A 给体（D 为卟啉大环）对有机太阳能电池（OSC）性能的影响，以[6,6]-苯基-C71-丁酸甲酯（PC BM）为电子受体。一个由 Ni-卟啉中心给体核（VC9）组成的新分子显示出深 HOMO 能级，基于优化的 VC9：PC BM 的 OSC 实现了 10.66%的整体功率转换效率（PCE）[短路电流密度（J）=15.48 mA/cm²，填充因子（FF）=0.65]，开路电压（V）高达 1.06 V，能量损耗非常低，为 0.49 eV，而 Zn-卟啉类似物 VC8：PC BM 的 PCE 为 9.69%，V 为 0.89 V，J 为 16.25 mA/cm²，FF 为 0.67。尽管基于 VC8 的 OSC 显示出比 VC9 更高的 J，这源于 VC8 更宽的吸收谱导致更多的激子生成，但 VC9 更高的 PCE 值归因于更高的 V 和更低的能量损耗。
