All-in-One Lewis Base for Enhanced Precursor and Device Stability in Highly Efficient Perovskite Solar Cells

Abstract

With skyrocketing interest and achievement of tremendous research efforts, perovskite solar cells are on the verge of commercialization. However, the stabilities of precursors and devices provide challenges for commercialization. Many researchers have dealt with these issues separately. Here, we introduce novel diphthalic anhydride-based Lewis base additives that address the precursor and device stability difficulties simultaneously. The added Lewis bases showed excellent interactions with Pb2+ and FA+ cations in the precursor and perovskite crystal. Accordingly, the facile Lewis-base-added perovskite precursor exhibited 85% ambient storage stability, and the device retained 90% of its initial efficiency after 1,000 h of heating at 80 °C (thermal) or 50% relative humidity atmospheric testing without encapsulation. Furthermore, the interaction between the facile Lewis base and various cations suppressed the related grain boundary defects, thus improving the efficiency from 19.58% of the control device to 22.43% of the target device.

Learning From Plants: Lycopene Additive Passivation toward Efficient and “Fresh” Perovskite Solar Cells with Oxygen and Ultraviolet Resistance

“…The electron lone pair of the CC bond could offer coordination with Pb 2+ using electron transfer to build Lewis acid–base interaction. [ 31 ] As for the perovskite structure as shown in Figure 4h, the I − vacancy with low defect formation energy is easily formed and leads to numerous uncoordinated Pb 2+ serving as deep defect traps at GBs to accelerate the serious non‐recombination and damage the photovoltaic performance. LCP possesses a number of CC double bonds on the molecular chain as extensive passivation sites themselves bond with uncoordinated Pb 2+ defects at GBs, which decrease the shallow and deep traps simultaneously through the Lewis acid–base effect.…”

Reactive Inhibition Strategy for Triple‐cation Mixed‐halide Perovskite Ink with Prolonged Shelf‐life

“…After being doped with DHP, the NMR resonance peak at ≈8.7 ppm splits into two new peaks at ≈8.6 and 8.9 ppm owing to the formation of hydrogen bonds between the NH bond in FA + and the O in ‐OH of DHP. [ 35,44 ] Clearly, when DHP is added to PbI 2 solution, the resonance absorption peak of the DHP shifts to upfield because the strong chemical interaction between the PO bonds of DHP and Pb 2+ ions reduces the electron cloud density at the periphery of the H nucleus in the DHP (Figure 1e). Besides, the interaction of DHP with Pb 2+ has also been verified by X‐ray photoelectron spectroscopy (XPS) with Pb 4f XPS peaks shifting to lower binding energy (Figure S1, Supporting Information).…”

“…[ 26 ] Lastly, the additive is applied to stabilize highly active FA +, such as the addition of 4,4 , ‐carbonyldiphthalic anhydride. [ 35 ] Although various strategies have been proposed to improve the stability of precursor solution, they solve the aging problem from just one aspect. And the effects of aging precursor solutions on crystal growth of efficient triple‐cation mixed‐halide perovskite are ignored.…”

A high-performance self-powered photodetector based on a concentric annular α-FAPbI3/MAPbI3single crystal lateral heterojunction with broadband detectivity

“…In the past decade, metal halide perovskites have attracted increased attention and have been widely employed in light-emitting diodes, 1,2 lasers, 3 solar cells, 4–7 photodetectors 8–11 and other optoelectronic fields due to their superior photoelectric properties, including a high optical absorption coefficient, 12,13 wide spectral response (UV-NIR), long carrier lifetime, 14 high carrier mobility (∼100 cm 2 V −1 s −1 ), 15,16 tunable direct band gap, 17 etc. To date, many groups have reported photodetectors based on polycrystalline perovskites, 18–22 and satisfactory results have been achieved in ultra-sensitivity, 23 rapid response speed, 24 wavelength selectivity 25,26 and other aspects.…”