Molecular Interaction Modulates Crystallization and Defects of Perovskite Films for High-Performance Solar Cells

Abstract

To modulate the crystallization and defects of perovskite grains, an organic small molecule, 9-(4-methoxyphenyl)-10-tosylphenanthrene (MPTP), is synthesized and introduced into the perovskite film. Different techniques (Fourier transform infrared spectroscopy, nuclear magnetic resonance, X-ray photoelectron spectroscopy) are used to reveal the hydrogen bonding and coordination interactions between MPTP and perovskite, which are also supported by density functional theory simulation. As a result, larger grains and reduced defects of perovskite films are obtained, along with lessened nonradiative recombination and enhanced hole extraction in resultant devices. The MPTP-treated devices show significantly improved efficiency from 20.9% to 23.04%, along with enhanced storage and thermal stability.

Efficiency enhancement to 24.62% in inverted perovskite solar cells through poly (ionic liquid) bulk modification

“…In addition, O in S=O exhibits a stronger negative charge than F in −CF 3 , suggesting that it can form hydrogen bonds with organic ions. N in the [PPyri] + moiety shows positive ESP, enabling it to immobilize halide ions through interaction with I − and Br − [22] . The interaction mechanism between P[STFSI][PPyri] and perovskite materials is depicted in Fig.…”

Chemical Chelation-Assisted Highly Oriented Perovskite Solar Cells with Reduced Non-radiative Loss

“…The addition of additives containing various functional groups (such as carbonyl, sulfonic, amino, halogens, etc.) to perovskite films is a promising strategy for regulating the crystallization of perovskite to obtain high-quality films and minimize the formation of defects. − An additive interacts with the perovskite components through electrostatic force to regulate the crystallization of perovskite films and passivate defects on the surface and at grain boundaries of perovskite films . The most common strategy is to introduce additives into the precursor solution.…”

Selective Electrochemical Synthesis of 9-Aryl-10-sulfonyl Substituted Phenanthrene from Alkynes and Sulfonyl Hydrazides

“…Phenanthrenes represent one of the essential polycyclic aromatic hydrocarbon (PAH) motifs in materials science . Among them, arylsulfonyl-phenanthrene played the role of an effective additive (MPTP) for perovskite films to improve the energy conversion efficiency and stability of perovskite solar cells, and it also was found in wide applications in organic electroluminescent material due to possessing relatively high luminescence efficiency and a low driving voltage (Scheme a) . On the other hand, arylsulfonyl-phenanthrene could act as a new kind of diaryl sulfone which constitutes the core motifs of drugs and pharmacologically active compounds .…”