Presentation Details
| Controlled crystal reorientationin Cs3Bi2I9 films using solvent and nanoparticle engineering Ankit Choudhary, Haralabos Efstathiadis. University at Albany, State university of New York, Albany, NY, USA |
Abstract
Bismuth (Bi) has recently been explored as an alternative to toxic lead (Pb) in perovskite photovoltaics, given that Bi-based perovskite-like absorbers offer both thermodynamic stability and distinctive optoelectronic properties. However, these materials still suffer from high pinhole density and poor film morphology. This work proposes physical morphological improvement strategies to improve the film quality. A combination of solvent engineering, solvent-vapor-assisted recrystallization, antisolvent treatment, and the introduction of titanium oxide nanoparticles to reorient perovskite crystals has been employed to produce high-quality, pinhole-free all-inorganic Cs3Bi2I9 films. X-ray diffraction spectroscopy (XRD) has verified the reorientation of perovskite crystals, and scanning electron microscopy (SEM) has shown pinhole-free perovskite films. The improved morphology is expected to reduce non-radiative recombination pathways and enhance charge transport. Ongoing work focuses on integrating these optimized films into complete photovoltaic devices, with current-voltage (I-V) characterization underway to quantify performance improvements.
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No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.
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