Polarity‐Controlled Attachment of Cytochrome C for High‐Performance Cytochrome C/Graphene van der Waals Heterojunction Photodetectors
Abstract
Biomolecule/graphene van der Waals heterojunction provides a generic platform for designing high‐performance, flexible, and scalable optoelectronics. A key challenge is, in controllable attachment, the biomolecules to form a desired interfacial electronic structure for a high‐efficiency optoelectronic process of photoabsorption, exciton dissociation into photocarriers, carrier transfer, and transport. Here, it is shown that a polarity‐controlled attachment of the Cytochrome c (Cyt c) biomolecules can be achieved on the channel of graphene field effect transistors (GFET). High‐efficiency charge transfer across the formed Cyt c/graphene interface is demonstrated when Cyt c attaches with positively charged side to GFET as predicted by molecular dynamics simulation and confirmed experimentally. This Cyt c/GFET van der Waals heterojunction nanohybrid photodetector exhibits a spectral photoresponsivity resembling the absorption spectrum of the Cyt c, confirming the role of Cty c as the photosensitizer in the device. The high visible photoresponsivity up to 7.57 × 104 A W−1 can be attributed to the high photoconductive gain in exceeding 105 facilitated by the high carrier mobility in graphene. This result therefore demonstrates a viable approach in synthesis of the biomolecule/graphene van der Waals heterojunction optoelectronics using polarity‐controlled biomolecule attachment, which can be expanded for on‐chip printing of high‐performance molecular optoelectronics.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 30, 2017
- Source ID
- 10.1002/adfm.201704797
Entities
People
- Bhupal Kattel
- Judy Z. Wu
- Maogang Gong
- Puja Adhikari
- Qingfeng Liu
- Ti Wang
- Wai‐lun Chan
- Wai‐yim Ching
- Youpin Gong
Organizations
- Army Research Office
- National Science Foundation
- Southern University of Science and Technology
- United States Department of Energy
- University of Kansas
- University of Missouri