Perovskite Colloidal Nanocrystal Solar Cells: Current Advances, Challenges, and Future Perspectives

Abstract

The power conversion efficiencies (PCEs) of polycrystalline perovskite (PVK) solar cells (SCs) (PC‐PeSCs) have been rapidly increased. However, PC‐PeSCs are intrinsically unstable without encapsulation, and their efficiency drops during large‐scale production; these problems hinder the commercial viability of PeSCs. Stability can be increased by using colloidal PVK nanocrystals (c‐PeNCs), which have high surface strains, low defect density, and exceptional crystal quality. Use of c‐PeNCs separates the crystallization process from film formation process, which is preponderant in large‐scale fabrication. Consequently, use of c‐PeNCs has substantial potential to overcome challenges encountered when fabricating PC‐PeSCs. Research on colloidal nanocrystal‐based PVK SCs (NC‐PeSCs) has increased their PCEs to the level greater than those of other quantum‐dot SCs, but has not reached the PCEs of PC‐PeSCs; this inferiority significantly impedes widespread application of NC‐PeSCs. This review at first introduces the distinctive properties of c‐PeNCs, then the strategies that have been used to achieve high‐efficiency NC‐PeSCs. Then it discusses in detail the persisting challenges in this domain. Specifically, the major challenge and solutions for NC‐PeSCs related to low short‐circuit current density Jsc are covered. Lastly, the article presents a perspective on future research directions and potential applications in the realm of NC‐PeSCs.This article is protected by copyright. All rights reserved

Modification strategies of lead halide perovskite nanocrystals for efficient and stable LEDs

“…In the past decade, much work has demonstrated that doping strategies can efficiently modulate and stabilize PNC lattices and enhance exciton radiation recombination for luminescence. 20,21 Additionally, the luminescence properties of PNCs are significantly influenced by factors such as the crystal size, surface ligand type, and dangling bonding mode. 22,23 Therefore, corresponding modification strategies have been proposed to improve the luminescence of PNCs.…”

Assessing the Optoelectronic Performance of Halide Perovskite Quantum Dots with Identical Bandgaps: Composition Tuning Versus Quantum Confinement

“…Halide perovskite (ABX 3 ) quantum dots (QDs) have been extensively applied in high-performing optoelectronic devices such as photovoltaic cells, − light-emitting diodes (LEDs), − detectors, − lasers, − and so on. − One of the most attractive properties of perovskite QDs is their highly tunable optical characteristics, which are suitable for versatile applications. − The bandgaps of perovskite QDs can be readily and extensively tuned by controlling the compositions of A, B, and X sites. , Consequently, identical bandgaps can be achieved by various combinations of chemical components such as mixed cations, mixed halides, or their combinations . At the same time, the bandgaps of perovskites can be broadly adjusted by controlling their sizes through the quantum confinement effect. ,− For instance, perovskite CsPbI 3 bulk film has an intrinsically fixed bandgap of 1.70 eV, while the bandgaps of CsPbI 3 QDs can be flexibly modified from 2.13 to 1.73 eV by varying the size of the QDs. ,, …”