ScholarWorks@성균관대학교

초록

Perovskite photodetectors (PPDs) without charge transport layers (CTLs) have recently garnered significant attention due to the limitations associated with organic and inorganic CTLs in conventional vertically structured PPDs. However, CTL-free PPDs reported so far have suffered from poor performance and stability, primarily due to charge extraction losses, non-radiative recombination at interfaces, and surface degradation caused by air and moisture. In this study, we propose a self-powered CTL-free PPD based on 2D/3D perovskite heterojunction to address these challenges. We demonstrate CTL-free 2D/3D PPDs featuring a metal electrode/2D perovskite/3D perovskite/transparent conducting oxide (TCO) structure, in which the 2D perovskite layer is derived from n-hexyl trimethyl ammonium bromide (HTABr). Our CTL-free 2D/3D PPDs exhibit markedly improved photoresponse properties compared to 3D-only PPDs, attributable to surface passivation and enhanced charge extraction facilitated by the 2D perovskite layer. Notably, the CTL-free 2D/3D PPD exhibits comparable performance to conventional CTL-based 3D PPD (metal electrode/CTL/3D perovskite/CTL/TCO), with a faster response time and improved long-term stability. To gain deeper insights into the 2D perovskite materials, computational calculations are performed along with the detailed characterization of HTABr-based thin films. Overall, this study offers a promising approach for developing efficient, stable, and cost-effective PPDs for next-generation optoelectronic applications. (c) 2026 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

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