Hot-Carrier Injection Antennas with Hemispherical AgO_x@Ag Architecture for Boosting the Efficiency of Perovskite Solar Cells

Abstract

In the past few years, the power conversion efficiencies (PCEs) of perovskite solar cells (PSCs) have increased from 3.81 to 25.2%, surpassing those of all almost all thin films solar cells. For high-performance PSCs, it is pivotal to finely regulate the charge dynamics and light management between perovskite and charge-transfer materials to balance the trade-off between optical and electrical properties. In this study, a hemispherical core–shell silver oxide (AgO x ) @ silver nanoparticles (Ag NPs) were grown onto the surface of the mesoporous titanium dioxide (m-TiO2) electron-transport layer (ETL) to improve the photogenerated charge transfer without sacrificing the stability of the devices. The results show that the electrical properties of m-TiO2 have been enhanced owing to the injection of a hot carrier in Ag NPs into the m-TiO2 ETL filling the trap states of m-TiO2. However, AgO x on the Ag NP surfaces can isolate the touch between Ag NPs and perovskite, thereby prohibiting the perovskite decomposition. Compared with the control device, the PCE was increased from 17.87 to 20.33% for the device with HOAPs. In the meantime, the long-term stability of the PSCs is not sacrificed, which is pivotal for fabricating PSCs and optoelectronic devices.

Interior/Interface Modification of Textured Perovskite for Enhanced Photovoltaic Outputs of Planar Solar Cells by an In Situ Growth Passivation Technology

“…The absorption spectrum exhibited by the AC-modified sample is almost identical to that exhibited by the unmodified film, implying that AC treatment has no significant contribution to the absorption and band gap in the visible wavelength region . By contrast, the PL intensity of the modified perovskite is significantly higher than that of the glass/PVK-D35 sample, indicating that the content of parasitic defects in the absorber is greatly reduced, which is conducive to inhibiting the nonradiation recombination and ultimately enhancing the photovoltaic performance of the device, particularly FF and V OC …”

Enhanced photovoltaic output of bifacial perovskite solar cells via tailoring photoelectric balance in rear window layers with 1T-WS2 nanosheet engineering

“…5(d), the PVK/SP + W sample degrades at a lower rate than the PVK/SP sample under the operating conditions or a thermal environment, which is attributed to 1T-WS 2 suppressing the movement of some active ions in the hybrid system (e.g., the migration/diffusion of Li ions in spiro-OMeTAD, the precipitation/migration of inorganic/organic ions in the absorber). 39,[41][42][43][44] The comprehensive results show that 1T-WS 2 plays an important role in improving the PV output and stability of b-PSCs. Such findings can drive the rapid development of innovative PV devices in the industry.…”

“…36,38 These results, which are consistent with the UPS and TRPL observations, suggest that the reduction in the energy band barrier induced by IT-WS 2 inhibits the heterointerface carrier aggregation and recombination, and effectively accelerates hole extraction/migration/collection, resulting in a significant improvement in the PV output of devices, especially short-circuit current density (J SC ) and FF. [36][37][38][39] The synergistic relationships among the hybrid HTL, charge behavior, and PV parameters of the solar cells were further elucidated by open-circuit photovoltage decay (OCVD) and dark-current measurements. The V OC decay curves shown in Fig.…”

“…36,38 These results, which are consistent with the UPS and TRPL observations, suggest that the reduction in the energy band barrier induced by IT-WS 2 inhibits the heterointerface carrier aggregation and recombination, and effectively accelerates hole extraction/migration/collection, resulting in a significant improvement in the PV output of devices, especially short-circuit current density ( J SC ) and FF. 36–39…”

Diluted-CdS Quantum Dot-Assisted SnO2 Electron Transport Layer with Excellent Conductivity and Suitable Band Alignment for High-Performance Planar Perovskite Solar Cells

“…The materials we used and the fabrication process of solar cells methods are based on our previous work. − The Supporting Information provides the details and the synthetic method of CdS QDs.…”