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Journal Articles Advanced Functional Materials Year : 2023

Coupling Ferroelectric to colloidal Nanocrystals as a Generic Strategy to Engineer the Carrier Density Landscape

Erwan Bossavit
Thomas Maroutian
Tung Huu Dang
Huichen Zhang
Yoann Prado
Claire Abadie
James Utterback
Mathieu Silly
Pavel Dudin
Jose Avila
Debora Pierucci

Abstract

The design of infrared nanocrystals-based (NCs) photodiodes faces a major challenge related to the identification of barriers with a well-suited band alignment or strategy to finely control the carrier density. Here, we explore a general complementary approach where the carrier density control is achieved by coupling a NC layer to a ferroelectric material. The up and down change in ferroelectric polarization directly impacts the NC electronic structure resulting in the formation of a lateral pn junction. This effect was uncovered directly using nano X-ray photoemission spectroscopy which shows a relative energy shift of 115 meV of the NC photoemission signal over the two different up-and down polarized ferroelectric regions, a shift as large as the open circuit value obtained in the diode stack. The performance of this pn junction reveals an enhanced responsivity and reduced noise that leads to a factor 40 increase in the detectivity value.
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hal-04097395 , version 1 (15-05-2023)

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Attribution - NonCommercial

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Mariarosa Cavallo, Erwan Bossavit, Sylvia Matzen, Thomas Maroutian, Rodolphe Alchaar, et al.. Coupling Ferroelectric to colloidal Nanocrystals as a Generic Strategy to Engineer the Carrier Density Landscape. Advanced Functional Materials, 2023, 2300846, ⟨10.1002/adfm.202300846⟩. ⟨hal-04097395⟩
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