Robust Self‐Assembled Molecular Passivation for High‐Performance Perovskite Solar Cells

Abstract

Defect passivation via post-treatment of perovskite films is an effective method to fabricate high-performance perovskite solar cells (PSCs). However, the passivation durability is still an issue due to the weak and vulnerable bonding between passivating functional groups and perovskite defect sites. Here we propose a cholesterol derivative selfassembly strategy to construct crosslinked and compact membranes throughout perovskite films. These supramolecular membranes act as a robust protection layer against harsh operational conditions while providing effective passivation of defects from surface toward inner grain boundaries. The resultant PSCs exhibit a power conversion efficiency of 23.34 % with an impressive open-circuit voltage of 1.164 eV. The unencapsulated devices retain 92 % of their initial efficiencies after 1600 h of storage under ambient conditions, and remain almost unchanged after heating at 85 °C for 500 h in a nitrogen atmosphere, showing significantly improved stability.

Facilitating the Carrier Transport Kinetics at the CsPbBr3/Carbon Interface through SbX3 (X = Cl, Br, I) Passivation

“…Reversely, SbI 3 donates part of the electrons, leading to the downshifting of the Pb peaks. 59 Further still, the Sb-Br bond strength was 314 KJ/mol, 60 higher than that of the Pb−Br bond (248.5 KJ/mol), so the substituted Br − can be effectively stabilized. Simultaneously, the introduction of Sb 3+ stabilizes the Br − in the crystal lattice and inhibited the formation of bromine vacancies (V Br ).…”

Constructing Chromium Multioxide Hole‐Selective Heterojunction for High‐Performance Perovskite Solar Cells

“…[27] Strategies of inserting an interlayer to modify the heterojunction between the perovskite and charge transport layers hence is highly desirable to boost optoelectronic properties of PSCs. [28][29][30] In this work, we demonstrate a highly efficient hole-selective heterojunction in the n-i-p planar PSCs, wherein a solutionprocessed chromium multioxide (CrO x ) interlayer is introduced between the perovskite and Spiro-OMeTAD. Metal oxides are superior in terms of conductivity, wide band gap, and stability than conjugated small molecule and polymers.…”

“…[ 27 ] Strategies of inserting an interlayer to modify the heterojunction between the perovskite and charge transport layers hence is highly desirable to boost optoelectronic properties of PSCs. [ 28 , 29 , 30 ]…”

High-conductivity thiocyanate ionic liquid interface engineering for efficient and stable perovskite solar cells

“…Electronic trap states caused by crystallographic defects including intrinsic point defects or higher-dimensional defects (such as lead clusters and grain boundaries (GBs)) are critical sources for non-radiative recombination and perovskite decomposition. 4,5 Considering that a perovskite material is an ionic crystal, the coordination number on its surface is always lower than in the bulk. Such surfaces are known to be unstable.…”

“…Electronic trap states caused by crystallographic defects including intrinsic point defects or higher-dimensional defects (such as lead clusters and grain boundaries (GBs)) are critical sources for non-radiative recombination and perovskite decomposition. 4,5…”