1 research outputs found
Hot Carrier Cooling Mediated Efficiency Enhancement in Diamine Passivated Perovskite Solar Cells
Slowing hot carrier (HC) cooling
in halide perovskites emerges
as an efficient strategy to enhance the power conversion efficiency
(PCE) of perovskite solar cells (PSCs). This approach facilitates
the rapid extraction of HCs before they dissipate within the intricate
lattice of the perovskite structure. In this investigation, we delve
into the impact of amine-based additives on the relaxation of HCs
in perovskite solar cells using a diamine 4,4′-diaminodiphenylmethaneiodide
salt (MDA). The diamine has been used as an in situ additive in the
perovskite precursor. The ultrafast femtosecond transient absorption
(fs-TA) spectroscopy study confirms that the diamine-modified film
slows the HC cooling time to 672 fs from the control (538 fs). Moreover,
MDA additive helps to improve crystallization and passivate the traps
for inhibiting nonradiative recombination, leading to higher PCE compared
to the control device. The passivated devices show impressive ambient
stability and retain 80% of initial PCE after 500 h. Our study provides
an in-depth understanding of how precise control of HC cooling through
additive engineering can improve the PSC’s efficiency and stability