2 research outputs found
Carrier Diffusion Lengths in Hybrid Perovskites: Processing, Composition, Aging, and Surface Passivation Effects
Carrier Diffusion Lengths in Hybrid Perovskites: Processing,
Composition, Aging, and Surface Passivation Effect
Surface Modulation via Conjugated Bithiophene Ammonium Salt for Efficient Inverted Perovskite Solar Cells
The
metal halide perovskite absorbers are prone to surface
defects,
which severely limit the power conversion efficiencies (PCEs) and
the operational stability of the perovskite solar cells (PSCs). Herein,
trace amounts of bithiophene propylammonium iodide (bi-TPAI) are applied
to modulate the surface properties of the gas-quenched perovskite.
It is found that the bi-TPAI surface treatment has negligible impact
on the perovskite morphology, but it can induce a defect passivation
effect and facilitate the charge carrier extraction, contributing
to the gain in the open-circuit voltage (Voc) and fill factor. As a result, the PCE of the gas-quenched sputtered
NiOx-based inverted PSCs is enhanced from
the initial 20.0% to 22.0%. Most importantly, the bi-TPAI treatment
can largely alleviate or even eliminate the burn-in process during
the maximum power point tracking measurement, improving the operational
stability of the devices