Dicyanovinylene-Substituted Selenophene-Thiophene Co-oligomers for Small-Molecule Organic Solar Cells
Dicyanovinylene-Substituted Selenophene-Thiophene Co-oligomers for Small-Molecule Organic Solar Cells
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DOI：
10.1021/cm201392c
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发表时间：
2011-10-25
影响因子：
8.6
通讯作者：
Baeuerle, Peter
中科院分区：
文献类型：
--
作者：
Haid, Stefan;Mishra, Amaresh;Baeuerle, Peter
我们报告的设计，合成和表征的一系列终端二氰基乙烯基取代的quinquechalcogenophenes作为光捕获有机太阳能电池的小分子供体材料。研究了这些五聚体的光谱、电化学和热学性质。噻吩单元被硒代物取代后，最长吸收带红移，摩尔消光系数增大。循环伏安法测量显示完全可逆的氧化和不可逆的还原过程。最高占据和最低未占据分子轨道（HOMO/LUMO）能级由电化学测量确定，并且位于-5.6和-3.8eV的范围内。用新型硫族苯作为供体和C-60作为受体制造的沉积的本体异质结太阳能电池显示出高达1 V的高开路电压，接近8（-2）的短路电流，以及超过3%的功率转换效率。
We report on the design, synthesis, and characterization of a series of terminal dicyanovinylene-substituted quinquechalcogenophenes as light-harvesting small-molecule donor materials for organic solar cells. The spectroscopic, electrochemical, and thermal properties of these pentamers were investigated. The replacement of thiophene unit(s) by selenophene(s) results in a bathochromic shift of the longest wavelength absorption band with concomitant increase of the molar extinction coefficient. Cyclic voltammetry measurements revealed fully reversible oxidation and irreversible reduction processes. The highest occupied and lowest unoccupied molecular orbital (HOMO/LUMO) energy levels were determined from electrochemical measurements and lie in the range of -5.6 and -3.8 eV. Vacuum-deposited bulk-heterojunction solar cells fabricated with the novel chalcogenophenes as donor and C-60 as acceptor displayed high open-circuit voltages of up to 1 V, short-circuit currents close to 8 mA.cm(-2), and power conversion efficiencies over 3%.