Lead-chelating hole-transport layers for efficient and stable perovskite minimodules

Abstract

The defective bottom interfaces of perovskites and hole-transport layers (HTLs) limit the performance of p-i-n structure perovskite solar cells. We report that the addition of lead chelation molecules into HTLs can strongly interact with lead(II) ion (Pb 2+ ), resulting in a reduced amorphous region in perovskites near HTLs and a passivated perovskite bottom surface. The minimodule with an aperture area of 26.9 square centimeters has a power conversion efficiency (PCE) of 21.8% (stabilized at 21.1%) that is certified by the National Renewable Energy Laboratory (NREL), which corresponds to a minimal small-cell efficiency of 24.6% (stabilized 24.1%) throughout the module area. Small-area cells and large-area minimodules with lead chelation molecules in HTLs had a light soaking stability of 3010 and 2130 hours, respectively, at an efficiency loss of 10% from the initial value under 1-sun illumination and open-circuit voltage conditions.

Ultrasensitive and Robust CsPbBr3 Single-Crystal X-ray Detectors Based on Interface Engineering

“…The CN stretch peak in BCP at 1630 cm –1 can be well distinguished. After mixing with Al powder, the CN stretching peak shifts to a smaller wavenumber of ∼1619 cm –1 , which illustrates the strong chelating interaction of BCP with Al . X-ray photoelectron spectroscopy (XPS) measurements were also performed to verify the interaction.…”

Defect Passivation in Quasi-2D Perovskite Light-Emitting Diodes by an Ibuprofen Additive

“…It suggested that there is an interaction between ibuprofen and PbBr 2 . 48 The trap density of states (tDOS) as a function of energy space 20 was calculated to look into the passivation effect of ibuprofen. As shown in Figure 2c, it is intuitively apparent that the defect state is diminished in a region of constrained energy space after ibuprofen decoration.…”

“…Quasi-2D organic–inorganic halide perovskites have garnered a lot of attention in recent years due to their exceptionally high photoluminescence quantum yields (PLQYs), high carrier mobility, high color purity (half-peak width of 20 nm), adjustable band gap (light covers the entire visible), long carrier diffusion length, solution treatability, and low-cost characteristics. − They have tremendous potential for applications in light-emitting diodes (LEDs), − solar cells, and photodetectors . Especially, they are recognized as the star material for the next generation of light-emitting diodes, since the external quantum efficiency (EQE) of the perovskite LEDs has surpassed 20%, which includes green, − red, and near-infrared light .…”

Constructing robust heterointerfaces for carrier viaduct via interfacial molecular bridges enables efficient and stable inverted perovskite solar cells

“…1–4 With power conversion efficiencies (PCEs) reaching over 25%, 5–8 state-of-the-art p–i–n devices have witnessed a gradual narrowing of the performance gap with their conventional (n–i–p) architecture counterparts of 25.7%. 6,9–11 However, the primary challenge to further enhance the performance of p–i–n PSCs is mainly correlated to hole transport materials (HTMs). 2,12–14 Notably, HTMs and semiconducting selective contacts can potentially impact the fill factor (FF), particularly for p–i–n devices, as they serve as film growth substrates at the bottom interface, which is crucial for perovskite crystallization, 13 interface defects, 15 and carrier extraction dynamics.…”