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Article Dans Une Revue Advanced Functional Materials Année : 2019

Response Enhancement of Self‐Powered Visible‐Blind UV Photodetectors by Nanostructured Heterointerface Engineering

Résumé

The development of efficient photodetectors (PDs) for ultraviolet (UV) light is of great importance for many applications. In the present paper, we propose a novel approach for boosting the performances of self-powered PDs. Visible-blind UV-A PDs have been built by combining a mesoporous TiO2 layer with a Spiro-OMeTAD layer. The nanostructured heterointerface has been engineered by inserting a self-assembled layer of organic modifiers. By choosing the 4-nitrobenzoic acid (NBA), the responsivity has been boosted by 70% compared to the pristine devices. It achieved 64 mA/W at 0 V bias, 380 nm and 1 mW.cm-2. The PD displayed a very high sensitivity (> 10 4), a fast response time (< 3ms), a high stability and repeatability. 4-chlorobenzoic acid, 4-methoxy benzoic acid, 4-nitro benzoic acid and β-alanine surface modifier have been studied by a combined experimental and theoretical approach. Their dipole moment has been calculated. Their presence induces a step in the 2 vacuum energy and the formed dipole field dramatically affects the charge transfer and then the photocurrent/photoresponse of the device. The higher responsivity of the NBA-modified PD has been thus explained by the better and faster electron charge transfer towards the electrical contact on TiO2.

Domaines

Chimie
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Dates et versions

hal-02236553 , version 1 (12-11-2020)

Identifiants

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Tao Zhu, Jun Su, J Alvarez, Grégory Lefèvre, Frédéric Labat, et al.. Response Enhancement of Self‐Powered Visible‐Blind UV Photodetectors by Nanostructured Heterointerface Engineering. Advanced Functional Materials, 2019, 29, pp.1903981. ⟨10.1002/adfm.201903981⟩. ⟨hal-02236553⟩
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