Mesoporous Au@Cu_2−xS Core–Shell Nanoparticles with Double Localized Surface Plasmon Resonance and Ligand Modulation for Hole‐Selective Passivation in Perovskite Solar Cells

Abstract

Perovskite solar cells (PSCs) have a great potential for commercialization due to their chemical versatility and tunable energy bands, [1] low-cost solution process, [2] and large-scale compatibility with flexible substrates. [3] During the past decade, we have witnessed a sharp increase in the record power conversion efficiencies (PCEs) from %3% to the most recently certified value of 25.5%, [4] comparable with that of silicon solar cells. Multiple strategies have been developed for raising the performance of PSCs, including the design and crystal growth of perovskite absorber, innovation of device architecture, defect passivation, and interface engineering. [4a,5] Among them, interface engineering stands out as an effective approach to control carrier dynamics and minimize carrier recombination within the PSCs. [6] The imperfect interface is a major limiting factor of the performance of PSCs. [7] Therefore, an optimal interface engineering can balance the charge generation, recombination, transportation, and extraction processes. [8] PSCs with an n-i-p architecture are usually termed as the conventional structure. Normally, the mobility of hole is lower than that of electron. The equilibrium between hole and electron-transport plays a key role in determining the device performance, which is closely related to the balanced charge extraction [9] and perfect interfacial band alignment. [10] Although many researchers have recently focused on optimizing

Interface Modification via Rare Earth Material to Assist Hole Migration for Efficiency and Stability Promotion of Perovskite Solar Cells

“…[ 28 ] The electrical properties of CeO 2 are analyzed in detail via the current ( J )–voltage ( V ) curves of the hole‐only device (FTO/spiro‐OMeTAD/CeO 2 /spiro‐OMeTAD/Au, as shown in the inset of Figure 1c and Figure S3, Supporting Information). Linear characteristics between J and V indicate an ohmic contact at the interface between CeO 2 and spiro‐OMeTAD [10b,29] . With the concentration optimization, the device with the CeO 2 concentration of 1.0 mg mL −1 in isopropanol (IPA) solution obtains the largest conductivity of 317.0 μS cm −1 , which can be beneficial for hole transferring.…”

Simple Ball‐Milled Molybdenum Sulfide Nanosheets for Effective Interface Passivation with Self‐Repairing Function to Attain High‐Performance Perovskite Solar Cells

“…The peaks at 104, 160, and 212 cm −1 are the signatures of PbI 2 . [ 32 ] Four peaks of 280, 375.5, 401.7, and 447 cm −1 originate from the bond of Mo—S. The remaining six peaks (250, 280, 607, 693, 710, and 1116 cm −1 ) could come from the bond of Pb—S or Pb—O.…”

Smart Design of Noble Metal–Copper Chalcogenide Dual Plasmonic Heteronanoarchitectures for Emerging Applications: Progress and Prospects

“…Au@Cu 2−x S heteronanostructures enhance the infrared absorption and intensify the local electric field at the perovskite/spiro-OMeTAD (2,2′,7,7′-tetrakis[N,N-di(4methoxyphenyl)amino]-9,9′-spirobifluorene) interface of collar cells (Figure 10A,B). 90 Also, the absorbance in the UV− visible region slightly increased compared with the pristine perovskite film. These mesoporous NPs contact sufficiently with spiro-OMeTAD, the hole transport layer material, to form channels for hole extraction and act as "bridges" for hole transfer.…”

“…Dual plasmonic nanomaterials exhibit tremendous potential in energy-related applications. Au@Cu 2– x S heteronanostructures enhance the infrared absorption and intensify the local electric field at the perovskite/spiro-OMeTAD (2,2′,7,7′-tetrakis­[ N , N -di­(4-methoxyphenyl)­amino]-9,9′-spirobifluorene) interface of collar cells (Figure A,B) . Also, the absorbance in the UV–visible region slightly increased compared with the pristine perovskite film.…”