title: Employing a Photosynthetic Antenna Complex to Interfacial Electron Transfer on ZnO Quantum Dot.
abstract: Photosynthetic antenna complexes exhibit unidirectional energy-transport phenomena, which make them potential photosensitizers in interfacial electron-transfer processes. In the present study, we show the antenna function of phycocyanin-allophycocyanin (PC-APC) complex using transient emission and absorption spectroscopy. Interfacial electron-transfer dynamics in the PC-APC complex sensitized ZnO semiconductor quantum dot material is compared in native and denatured conditions. The downhill sequential energy transfer from a peripheral phycocyanin disk to a core allophycocyanin disk opens a new electron injection pathway from the allophycocyanin disk in addition to primary electron injection from directly photoexcited phycocyanin disk. Further, the large association of phycocayanobilin chromophores in PC-APC conjugates stabilizes the positive charge within the sensitizer, which leads to slower charge recombination in comparison to that in denatured condition. This study displays the antenna function of energy-efficient biomolecules in favor of better charge separation across the semiconductor interface.
authors: †Radiation and Photochemistry Division and ‡Molecular Biology Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
authors: Sandeep
authors: S
authors: Verma
authors: †Radiation and Photochemistry Division and ‡Molecular Biology Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
authors: Alka
authors: A
authors: Gupta
authors: †Radiation and Photochemistry Division and ‡Molecular Biology Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
authors: Jayashree K
authors: JK
authors: Sainis
authors: †Radiation and Photochemistry Division and ‡Molecular Biology Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
authors: Hirendra N
authors: HN
authors: Ghosh
keywords: ZnO; allophycocyanin; electron transfer; energy transfer; phycocyanin