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Electron Transport across Phycobiliprotein Films and Its Optoelectronic Properties


 Biomolecules such as proteins, peptides have an intimate relationship with various life activities for biological functions. Very recent, contemporary work with biomolecules mainly focuses on their application in emerging nanoscale electronics where proteins and peptides are integrated as the sensing materials. Here, we have explored the optoelectronics functionality of combined proteins known as phycobiliproteins by investigating electron transport behavior across the protein films in a dark state and under white light illumination. The photochemical activity of the protein was more stable in a solid state/ thin film form with tightly bonded water molecules than in buffer solution. Our studies demonstrate that phycobiliprotein films modulate their electrical conductivity within their different states, originating from the conformation alteration of cysteine-conjugated bilin chromophores to apo-protein and electrostatic environment around the chromophores.