Acentric 2-D Ensembles of D-br-A Electron-Transfer Chromophores via Vectorial Orientation within Amphiphilic n-Helix Bundle Peptides for Photovoltaic Device Applications
Acentric 2-D Ensembles of D-br-A Electron-Transfer Chromophores via Vectorial Orientation within Amphiphilic n-Helix Bundle Peptides for Photovoltaic Device Applications
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DOI：
10.1021/la205002f
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发表时间：
2012-02-14
期刊：
影响因子：
3.9
通讯作者：
Blasie, J. Kent
中科院分区：
文献类型：
--
作者：
Koo, Jaseung;Park, Jaehong;Blasie, J. Kent
我们表明，简单设计的两亲性4-螺旋束肽可用于矢量定向线性延伸的供体-桥受体（D-br-A）电子转移（ET）发色团在其核心。研究表明，束的内部为D-br-A组装提供了在传统溶剂中无法接近的独特溶剂化环境，从而控制光致ET和热电荷复合速率常数的大小。束的外部的两亲性被用于在液-气界面处矢量地定向肽-发色团复合物，X射线和其末端被定制用于随后经由“定向组装”方法共价附接至无机表面。结构数据，结合对这些肽-发色团复合物所表现出的激发态动力学的评估，证明了这种复合物在接近1/200埃的高面内发色团密度下的密集堆积的、无中心有序的2-D单层集合体（2）提供了作为二元异质结光伏器件中的活性层的独特潜力。
We show that simply designed amphiphilic 4-helix bundle peptides can be utilized to vectorially orient a linearly extended donor-bridge acceptor (D-br-A) electron transfer (ET) chromophore within its core. The bundle's interior is shown to provide a unique solvation environment for the D-br-A assembly not accessible in conventional solvents and thereby control the magnitudes of both light-induced ET and thermal charge recombination rate constants. The amphiphilicity of the bundle's exterior was employed to vectorially orient the peptide-chromophore complex at a liquid-gas interface, X-ray and its ends were tailored for subsequent covalent attachment to an inorganic surface, via a "directed assembly" approach. Structural data, combined with evaluation of the excited state dynamics exhibited by these peptide-chromophore complexes, demonstrate that densely packed, acentrically ordered 2-D monolayer ensembles of such complexes at high in-plane chromophore densities approaching 1/200 angstrom(2) offer unique potential as active layers in binary heterojunction photovoltaic devices.