Quantum Dot Interface-Mediated CsPbIBr₂ Film Growth and Passivation for Efficient Carbon-Based Solar Cells

Abstract

CsPbIxBry-based all-inorganic perovskite materials are a potential candidate for stable semitransparent and tandem structured photovoltaic devices. However, poor film (morphological and crystalline) quality and interfacial recombination lead consequently to a decline in the photoelectric conversion performance of the applied solar cells. In this work, we incorporated PbS quantum dots (QDs) at the interface of electron transporting layer (ETL) SnO 2 and perovskite to modulate the crystallization of CsPbIBr 2 and the interfacial charge dynamics in carbon-based solar cells. The ascasted PbS QDs behave as seeds for lattice-matching the epitaxial growth of pinhole-free CsPbIBr 2 films. The modified films with reduced defect density exhibit facilitated carrier transfer and suppressed charge recombination at the ETL/perovskite interface, contributing to an enhanced device efficiency from 7.00 to 9.09% and increased reproducibility and ambient stability. This strategic method of QD-assisted lattice-matched epitaxial growth is promising to prepare high-quality perovskite films for efficient perovskite solar cells.

Boosting the performance and stability of inverted perovskite solar cells by using a carbolong derivative to modulate the cathode interface

“…The shorter lifetime after the usage of the CIL signifies the enhanced carrier extracted to the electrodes in the CIL modified PSCs. 25 We further performed time-resolved photoluminescence (TRPL) to characterize the carrier transport dynamics in the PSCs with and without the CIL as presented in Fig. 5(C).…”

“…A larger semicircle of the PSCs with the CIL corresponds to a larger R rec , which indicates the inhibited carrier recombination in the devices with the CIL. 25 Therefore, the reduction of the Ag WF enabled by the CIL leads to improved carrier transport and suppressed carrier recombination at the ETL/cathode interface, contributing to the much-boosted device FF and J sc .…”

Synergistic Effects of Bipolar Additives on Grain Boundary-Mediated Charge Transport for Efficient Carbon-Based Inorganic Perovskite Solar Cells

“…From the EIS spectra of the two solar cells, an enlarged charge transfer recombination resistance ( R ct ) was obtained for the GB-modified device at each bias voltage (Figure e). This indicates that the charge transport among grains and GBs are energetically more favorable in the target cell than that in the control sample. − We, therefore, depict the comprehensive mechanism of GB-modified charge dynamics of solar cells in Figure f. Compared with the traditional GBs that trap electrons and holes and cause recombination loss, the strategically modified GBs would effectively accept charges from defect states and thereafter efficiently extract them with high mobility and conductivity.…”

Interface engineering using a neutral carbolong complex for efficient and stable p–i–n perovskite solar cells

“…To compare the electron transport mobility of NC with that of BCP, we carried out a transient photocurrent (TPC) characterization. 26 As shown in Fig. 4b, a shorter transient lifetime was found for a device based on NC (0.37 μs) than for one based on BCP (0.48 μs), indicating facilitated electron transport when incorporating NC as a CIL in a PSC, with such facilitated transport explaining the higher J sc and FF in the NC -based PSCs than in the BCP-based ones.…”

“…To compare the carrier recombination dynamics, we further carried out electrochemical impedance spectroscopy (EIS) analyses. 26,27 As shown in Fig. 4c, the resulting plots showed a larger semicircle for the NC -based device, revealing its inhibited carrier recombination, which benefited from the reduced interfacial energy barrier and improved electron transport mobility, leading to a slightly enhanced device V oc .…”