Quantum dots coupled to oriented 2D crystalline matrix for solar cell application.
Authors of this article are:
Mandal D, Rath AK.
A summary of the article is shown below:
Colloidal quantum dots (QDs) have emerged as promising material to harness panchromatic solar light, owing to their size-tunable optoelectronic properties. Advancements in surface passivation strategy and processing technique have contributed immensely to their developments in photovoltaic applications. Recently, surface passivation using halometallate ligands is shown to form a protective shell layer in reducing the structural and energetic disorder in the QD solid. Here, we report lead sulfide (PbS) QDs coupled to oriented two-dimensionally (2D) confined crystalline matrix by using halometallate ligand. The QDs undergo surface re-construction during the ligand treatment process which leads to change in their shape, size and axis length. We show that the 2D matrix is a combination of two distinct crystalline layers consists of crystalline Pb-amine complex and 2D perovskite layer. The thickness of the matrix layer is modulated further by adjusting counter cation which results to the enhancement in charge carrier mobility, carrier recombination lifetime and diffusion length in QD solid. 2D passivated QDs are implemented to fabricate the photovoltaic devices with high power conversion efficiency of 9.1%.
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