Local-Illuminated Ultrathin Silicon Nanomembranes with Photovoltaic Effect and Negative Transconductance

Ultrathin silicon nanomembranes (SiNMs) on insulators under local illumination reveal a gate-controlled photovoltaic effect and negative transconductance in Schottky transistors applying both homo-and heterocontacts. Tiny variations of Schottky barriers between source and drain contacts are responsible for the photovoltaic effect in ultrathin SiNMs and can be enhanced by gate voltage and/or contact design.