Patent · US Active

Image sensor with an absorption enhancement semiconductor layer

US10861988B2 · kind B2 · utility

1Cited by
0References
20Claims
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Inventors

Key dates

Filing dateNov 13, 2019
Grant dateDec 8, 2020
Priority date
Expiry dateNov 13, 2039

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH10F39/8063

Abstract

An image sensor with an absorption enhancement semiconductor layer is provided. In some embodiments, the image sensor comprises a front-side semiconductor layer, an absorption enhancement semiconductor layer, and a back-side semiconductor layer that are stacked. The absorption enhancement semiconductor layer is stacked between the front-side and back-side semiconductor layers. The absorption enhancement semiconductor layer has an energy bandgap less than that of the front-side semiconductor layer. Further, the image sensor comprises a plurality of protrusions and a photodetector. The protrusions are defined by the back-side semiconductor layer, and the photodetector is defined by the front-side semiconductor layer, the absorption enhancement semiconductor layer, and the back-side semiconductor layer.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.