1. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon 999077, Hong Kong
2. Materials Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, United States
3. Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States
4. Farm Technology Group, Wageningen University & Research, Wageningen 6700 AA, The Netherlands
5. Department of Electrical and Computer Engineering, University of California, Davis, California 95616, United States
6. Department of Electrical, Electronic and Computer Engineering, Gifu University, Gifu 501-1193, Japan
7. Geballe Laboratory for Advanced Materials, Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
8. The Norwegian Colour and Visual Computing Laboratory, NTNU-Norwegian University of Science and Technology, 2802 Gjøvik, Norway