演讲题目：Graphene-based Solar Cells and Photodetectors
内容摘要
Graphene has the potential for creating thin film devices, owing to its two-dimensionality and structural flatness. Graphene serves multiple functions as transparent electrode, active junction layer, hole collector and anti-reflection layer in the graphene-on-semiconductor heterojunction solar devices. Chemical doping reduces the sheet resistance and increases the work function of graphene, while organic filling of graphene facilitates the hole injection and extraction, resulting in high-quality Schottky junctions and enhanced solar energy conversion efficiency. Nanowires, micropillars of semiconductors further reduce the use of materials, significantly suppress the reflection, and provide more surface for light harvesting.
The Schottky junction properties and photoelectric conversion of reduced graphene oxide (RGO) have also been investigated, primarily by analyzing their current-voltage characteristics. The ON/OFF ratio, responsivity and detectivity of the RGO/n-Si photodetectors are closely examined, proving that RGO material could be effectively utilized as the electrode material; plus, their relationship with the RGO reduction levels has also been explored. By analyzing the response/recovery speed of the RGO-based photodetectors, we have studied the effects of oxygen-containing functional groups and crystalline defects on the photoelectric conversion.
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