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We have demonstrated organometallic perovskite solar cells (PSCs) based on Au decorated TiO2 nanofibers and methylammonium lead iodide (MAPbI3). A power conversion efficiency of 14.92% was achieved, which is significantly higher than that of conventional mesoporous (mp) TiO2, as well as TiO2 nanofiber-based devices. The present synthetic process provides new opportunities for the development of efficient plasmonic PSCs based on metal oxide nanofibers. Solar cells based on these architectures exhibit a short-circuit current density J(SC) of 21.63 ± 0.36 mA cm(-2), V(OC) of 0.986 ± 0.01 V and fill factor of 70% ± 3%, which provide a power conversion efficiency of 14.92% ± 0.33% under standard AM 1.5 conditions. The results of time-resolved photoluminescence (TRPL) spectroscopy and solid-state impedance spectroscopy (ssIS) revealed that PSCs based on Au-decorated TiO2 nanofibers exhibit a low recombination rate. The present results are much higher than those for reported PSCs based on a Au@TiO2 electron-transporting layer (ETL).

In the current work, we studied the effect of the passivation of atomic layer deposited (ALD) ultrathin TiO2 on hydrothermally grown one-dimensional (1D) TiO2 nanorod (NR) arrays for solid-state perovskite-sensitized solar cells. Different thicknesses of ALD-passivated TiO2 were deposited on the hydrothermally grown 1D TiO2 NR samples. The ALD TiO2 thickness was varied from 1 to 5 nm by variation of the growth cycle. Our controlled results revealed that the 4 nm thin-layer-passivated TiO2 NR sample shows a power conversion efficiency (PCE) as high as η = 12.53% (without masking) for the CH3NH3PbI3 perovskite absorbing layer. Our results revealed that the solar cell performance with different ALD passivation thicknesses strongly affects the open-circuit voltage (V OC) as well as the short-circuit current density (J SC). However, compared with high-temperature-processed standard device configurations based on TiCl4-treated mesoporous TiO2 (mp-TiO2) (∼10%) and TiCl4-treated TiO2 NR (∼9%) perovskite solar cells, our low-temperature-processed, pinhole-free ALD-passivated devices exhibit higher PCEs. The 4 nm passivated sample exhibits η = 12.53 ± 0.35% with J SC = 19.23 ± 0.53 mA cm–2, fill factor (FF) = 0.70 ± 0.4, and V OC = 0.931 ± 0.01 V. By control of the ultrathin passivation layer thickness, our champion cell with 4.8 nm ALD passivated TiO2 NRs demonstrated a PCE of 13.45% with J SC = 19.78 mA cm–2, V OC = 0.945 V, and FF = 0.72. These results further emphasize hydrothermally grown 1D TiO2 and ALD-passivated electron transporting layers (ETLs) for efficient perovskite solar cell applications.

These results suggest that HER2-mediated endocytosis is involved in the PILs formulation. The ability of the PILs formulation to efficiently and specifically deliver paclitaxel to the HER2-overexpressing cancer cells implies that it is a promising strategy for tumor-specific therapy for HER2-overexpressing breast cancers.

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Easy processability and high stability are key features of methylammonium lead bromide (CH 3 NH 3 PbBr 3 )-based perovskite solar cells. The main focus of the present work was to fabricate and evaluate the stability of CH 3 NH 3 PbBr 3 quantum dot (QD)-based perovskite solar cells. We used an ex situ solution process to synthesize CH 3 NH 3 PbBr 3 QDs and then successfully fabricated mesoscopic solid-state perovskite solar cells. We also studied the influence of different CH 3 NH 3 PbBr 3 QD sizes and different holetransporting materials (HTMs), 2,2′,7,7′-tetrakis-(N,N-di-4-methoxyphenylamino)-9,9′-spirobifluorene (spiro-MeOTAD) and poly[bis (4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA), on the solar cell performance. The size of the CH 3 NH 3 PbBr 3 QDs was controlled by the solution processing parameters. Our controlled results show that spiro-MeOTAD-and PTAA-based devices exhibited, respectively, an open-circuit voltage (V OC ) of 0.991 and 1.091 V and a current density (J SC ) of 11.68 and 12.05 mA cm − 2 , which resulted in an average power conversion efficiency (PCE) of 7.35 and 9.44% under a standard 100 mW cm − 2 illumination without masking. Our best-performing cell, which contains the FTO/Bl-TiO 2 /mp-TiO 2 +CH 3 NH 3 PbBr 3 (~2-nm QDs)/PTAA/Au configuration shows the following results: open-circuit voltage (V OC ) = 1.110 V, current density (J SC ) = 14.07 mA cm − 2 , fill factor = 0.73 and an 11.40% PCE. Furthermore, the CH 3 NH 3 PbBr 3 -based devices are stable for more than four months.

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