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In this study, the effects of the various types of PEDOT:PSS with different conductivities on the photovoltaic parameters of organic solar cells were investigated. The performances of five various commercially available PEDOT:PSS with formulations such as FET, PT2, PH1000, PH500 and PH were compared. It was observed that the device employing PH1000 as an interlayer between ITO and the active layer exhibited the highest photovoltaic performance as compared to other devices with FET, PT2, PH500 and PH. Copyright © 2015 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

[Display omitted] • First-time demonstration of Ce and Zn co-doped NiO x layers and employment in inverted perovskite solar cells. • Co-doping with an optimum ratio of Ce and Zn increased the work function, electrical conductivity, hole concentration, and mobility of the NiO x layers. • Enhanced interface quality and decreased trap density in perovskite layer resulted in better device stability. • Fully solution-processed perovskite solar cells fabricated under 50–55% humidity using only γ-butyrolactone employed perovskite precursor for methylammonium lead tri-iodide and record power conversion efficiencies achieved. Cerium and zinc co-doped nickel oxide (NiO x) hole transporter layers (HTLs) developed for boosting the efficiency and stability of inverted methylammonium lead tri-iodide (CH 3 NH 3 PbI 3) based glove box-free fabricated solar cells. Combining our humidity resistive gamma butyrolactone-based perovskite deposition route with an optimum doping ratio of NiO x :Zn-Ce (18:6 mmol %) layers, power conversion efficiencies boosted from 10.04% to 14.47% and stability is increased under aging conditions. This performance enhancement was questioned over NiO x layers, quality of perovskite layer and the interface between charge transport layers and perovskite. Zn doping increased the electrical conductivity while incorporation of Ce created a positive impact on surface morphology and interface quality by a decreased roughness compared to the only Zn doped layers. The work function, hole mobility and concentration were found to increase with co-doping. Besides, the trap density of the perovskite layer is lessened, hindering unfavorable charge recombination confirmed by space charge limited current (SCLC) and photoluminescence (PL) analysis. [ABSTRACT FROM AUTHOR]

• Synthesis and characterization of a novel benzotriazol based small molecule (BTBT). • Evaluation of BTBT molecule as an interlayer in perovskite solar cells. • Low temperature fabrication route using inverted perovskite solar cell geometry. • Achievement of high efficiencies without glove box conditions under high humidity. • Improvement of efficiency using BTBT as an interlayer between ITO and PEDOT:PSS. A novel benzotriazol based small molecule (2-hexyl-4,7-bis(5′-hexyl-2,2′-bithien-5-yl)-2H-1,2,3-benzotriazole) "BTBT" was synthesized by Suzuki coupling reaction and was successfully employed in planar inverted perovskite solar cells with ITO/BTBT/PEDOT:PSS/CH 3 NH 3 PbI 3-x Cl x /PCBM/Al configuration. Fabrication processes, including the spin coating of the perovskite layer, were performed in ambient air, under high humidity conditions (>60%). BTBT/PEDOT:PSS bilayer notably improved the power conversion efficiencies (PCE) from 9.65% to 11.6%, which corresponds to an increase of 20%. [ABSTRACT FROM AUTHOR]

In this report, two novel donor-acceptor-donor type triphenylamine-quinoxaline-based (QC-TPA and QC-TPAOMe) small organic molecules have been synthesized by the Suzuki coupling reaction as hole transport materials (HTMs) and successfully utilized in the NiO x /perovskite interface. All device fabrication steps with ITO/NiO x /QC-TPA or QC-TPAOMe/CH 3 NH 3 PbI 3 /PCBM/BCP/Ag configurations were performed in ambient air over 55% relative humidity, except for thermal evaporation of metal contacts. Modifications of the NiO x /perovskite interface with QC-TPA and QC-TPAOMe molecules can improve FF and J SC by enhancing hole extraction and reducing energy losses. Consequently, the power conversion efficiency (PCE) boosted from 10.03% to 14.46% and 13.21% with surface modifications of NiO x with QC-TPA and QC-TPAOMe, respectively. [Display omitted] • Novel donor-acceptor-donor small organic molecules as interlayers in perovskite solar cells. • Interface materials are used to passivate interface defects and eliminate pinholes. • Modifications of the interface improve hole extraction and reduce energy losses. [ABSTRACT FROM AUTHOR]