[1
]Institute
of Microelectronics and Tsinghua National Laboratory for Information
Science
and Technology (TNList), Tsinghua University, Beijing 100084, China
[2
]Department
of Electrical Engineering, Princeton University, Princeton, New Jersey
08544, United States
[3
]Princeton
Institute for Science and Technology of Materials, Princeton University,
Princeton, New Jersey 08544, United States
[4
]Andlinger
Center for Energy and the Environment, Princeton University, Princeton,
New Jersey 08544, United States