CsPbBr₃ Nanocrystal Induced Bilateral Interface Modification for Efficient Planar Perovskite Solar Cells

Abstract

Organic-inorganic halide perovskite solar cells (PSCs) have drawn tremendous attention owing to their remarkable photovoltaic performance and simple preparation process. However, conventional wet-chemical synthesis methods inevitably create defects both in the bulk and at the interfaces of perovskites, leading to recombination of charge carriers and reduced stability. Herein, a bilateral interface modification to perovskites by doping room-temperature synthesized CsPbBr 3 nanocrystals (CN) is reported. The ultrafast transient absorption measurement reveals that CN effectively suppresses the defect at the SnO 2 /perovskite interface and boosts the interfacial electron transport. Meanwhile, the in situ Kelvin probe force microscopy and contact potential difference characterizations verify that the CN within the upper part of the perovskites enhances the built-in electric field, facilitating oriented migration of the carriers within the perovskite. Combining the superiorities of CN modifiers on both sides, the bilaterally modified CH 3 NH 3 PbI 3 -based planar PSCs exhibit optimal power conversion efficiency exceeding 20% and improved device stability.

Biosynthesis of quantum dots and their usage in solar cells: insight from the novel researches

“…In addition, Like s-QDs the carbon-based nanomaterials have high fluorescence yield and resistance to photo-bleaching; at variance C-QDs, they are biocompatible, non-toxic and easy to functionalize [22]. Therefore, sustainable QDs researches to achieve good performance in solar cell applications develop along different routes to optimize C-QDs and s-QDs [46]. For marketable requests in illumination and taillight screen, the steadiness of perovskite QDs needs additional enhancement to avoid their humiliation by heat, oxygen, humidity, and light.…”

Interfacial Modification Engineering with Cs3Cu2I5 Nanocrystals for Efficient and Stable Perovskite Solar Cells

“…Finally, the PCE of CsPbBr 3 NCs‐modified PSCs was substantially exceeding 20% and enhancing device stability. [ 30 ] Although the organic–inorganic or all‐inorganic low‐dimensional perovskite materials with ordinary structure can passivate the defects located on the perovskite film, cation–anion of these materials cannot efficiently diffuse into perovskite film, resulting in undesirable performance of PSCs. Beyond that, the common low‐dimensional perovskite materials have no excellent moisture stability.…”

Quinary Nanocrystal‐Based Passivation Strategy for High Efficiency and Stable Perovskite Photovoltaics

“…In this regard, a wide variety of approaches have been reported to control crystallization process of active layers. [ 14–17 ]…”

“…In this regard, a wide variety of approaches have been reported to control crystallization process of active layers. [14][15][16][17] For instance, various chemical additives such as ionic liquids, small molecules or metal ions have been introduced in the precursor solution to facilitate the growth of larger perovskite grains (for less GBs) by slow down the crystallization process. [11,[18][19][20][21] The control of supersaturation level of the perovskite precursor solution is extensively implemented to manage the rate of nucleation, which facilitates the modulation of nucleation rate, where the slow nucleation rate facilitates the formation of larger perovskite grains.…”