Thin silicon interference solar cells for targeted or broadband wavelength absorption enhancement

Zeynep Durmaz, Sebastian Husein, Rebecca Saive*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

We present the concept of interference solar cells reliant on spectrum filtering or splitting to enhance absorption in thin (<13 µm) silicon absorber layers, both for targeted wavelengths and broadband absorption. Absorption enhancement in the long wavelength regime is achieved by fine-tuning of device layer thicknesses to provide destructive interference between reflected and escaped waves. We suggest this concept is also suitable for broadband absorption enhancement when combined with spectrum splitting optics through gradual thickness changes laterally across the device. Using the example of silicon heterojunction solar cells, we have computationally demonstrated a short circuit current density enhancement of 19% (from 25.8 mA/cm2 to 30.7 mA/cm2) compared to a silicon heterojunction cell of the same absorber layer thickness.

Original languageEnglish
Pages (from-to)4324-4337
Number of pages14
JournalOptics express
Volume29
Issue number3
DOIs
Publication statusPublished - 1 Feb 2021

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