1. Advanced Devices & Sustainable Energy Laboratory (ADSEL), Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
2. Tyndall National Institute, Lee Maltings, Cork T12 R5CP, Republic of Ireland
3. The Centre for Advanced Photonics & Process Analysis, Munster Technological University at Tyndall National Institute, Cork T12R5CP, Republic of Ireland
4. Center for Energy Harvesting Materials and Systems (CEHMS), Mechanical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States