Revealing Defective Interfaces in Perovskite Solar Cells from Highly Sensitive Sub-bandgap Photocurrent Spectroscopy Using Optical Cavities

Abstract

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Dual Interface Passivation in Mixed-Halide Perovskite Solar Cells by Bilateral Amine

“…The 2D/3D interaction can increase device stability, but it greatly limits photocurrent charge transfer, which reduces device efficiency. 33,34 According to a rational design approach put forth by Zhang et al, a metastable polymorph of the Dion− Jacobson 2D structure based on asymmetric organic molecules can lower the energy barrier for hole transport, resulting in highly efficient and reliable perovskite solar cells. 35 Chen et al presented a heterostructure of 2D/3D perovskite layers employing bulkier organic cations that stimulate preferential growth of n ≥ 3 reduced-dimensional perovskites (RDPs), resulting in a quasi-steady-state PCE of 23.91% for inverted perovskite solar cells.…”

Charge Transfer Kinetics in Halide Perovskites: On the Constraints of Time-Resolved Spectroscopy Measurements

“…18,19 If defects are localized at the interface, they can introduce additional barriers for carrier extraction. 20 The diffusion/ migration of carriers to the extraction layer interface depends on the thickness, morphology (e.g., grain size/boundary), and preparation method of the perovskite absorber, which introduces additional uncertainty. 21 All of these factors together manifest in a large dispersion (up to several orders of magnitude) of the carrier extraction rate constants (or related excited state lifetimes) even when the same technique is used for ostensibly the "same" material.…”