Presentation Details
| Band-Offset Maps and Defect Tolerance in Bromide-Rich High-Bandgap Perovskite Solar Cells Antonio Fronteddu, Federica Cappelluti. Department of Electronics and Telecommunications, Politecnico di Torino, Turin, Italy |
Abstract
Bromide-rich high-bandgap perovskite solar cells are
prone to a pronounced open-circuit-voltage deficit with respect to
the radiative limit set by their bandgap. We use drift–diffusion
device simulations to study how trap-assisted recombination and
interfacial band alignment jointly limit performance in a
PTAA/perovskite/SnO2 p–i–n stack with ~2.3 eV absorber.
Benchmarking against experimental data indicates that, for
nominal offsets, literature-consistent bulk and interface trap
densities cannot reproduce the low measured voltage without
unrealistically high defect parameters. Band-offset maps reveal
interface-dominated loss regions and distinct alignment conditions
that either reproduce low voltage with reasonable fill factor or
allow for high defect tolerance and high voltage.
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.
prone to a pronounced open-circuit-voltage deficit with respect to
the radiative limit set by their bandgap. We use drift–diffusion
device simulations to study how trap-assisted recombination and
interfacial band alignment jointly limit performance in a
PTAA/perovskite/SnO2 p–i–n stack with ~2.3 eV absorber.
Benchmarking against experimental data indicates that, for
nominal offsets, literature-consistent bulk and interface trap
densities cannot reproduce the low measured voltage without
unrealistically high defect parameters. Band-offset maps reveal
interface-dominated loss regions and distinct alignment conditions
that either reproduce low voltage with reasonable fill factor or
allow for high defect tolerance and high voltage.
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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