7 research outputs found

    Copper Iodide Interlayer for Improved Charge Extraction and Stability of Inverted Perovskite Solar Cells

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    Nickel oxide (NiO) is one of the most promising and high-performing Hole Transporting Layer (HTL) in inverted perovskite solar cells due to ideal band alignment with perovskite absorber, wide band gap, and high mobility of charges. At the same time, however, NiO does not provide good contact and trap-free junction for hole collection. In this paper, we examine this problem by developing a double hole transport configuration with a copper iodide (CuI) interlayer for efficient surface passivation. Transient photo-current (TPC) measurements showed that Perovskite/HTL interface with CuI interlayer has an improved hole injection; CuI passivation reduces the concentration of traps and the parasitic charge accumulation that limits the flow of charges. Moreover, we found that CuI protect the HTL/perovskite interface from degradation and consequently improve the stability of the cell. The presence of CuI interlayer induces an improvement of open-circuit voltage VOC (from 1.02 V to 1.07 V), an increase of the shunt resistance RSH (100%), a reduction of the series resistance RS (−30%), and finally a +10% improvement of the solar cell efficiency

    Influence of the Dielectric Matrix on the Electrical Nanocomposites Based on Oxidized Multi-Walled Carbon Nanotubes

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    Π’ Π΄Π°Π½Π½ΠΎΠΉ Ρ€Π°Π±ΠΎΡ‚Π΅ рассмотрСно влияниС ΠΎΠΊΠΈΡΠ»ΠΈΡ‚Π΅Π»ΡŒΠ½Ρ‹Ρ… ΠΎΠ±Ρ€Π°Π±ΠΎΡ‚ΠΎΠΊ Π½Π° свойства многослойных ΡƒΠ³Π»Π΅Ρ€ΠΎΠ΄Π½Ρ‹Ρ… Π½Π°Π½ΠΎΡ‚Ρ€ΡƒΠ±ΠΎΠΊ (МУНВ). РассмотрСны ΡΠΊΡΠΏΠ΅Ρ€ΠΈΠΌΠ΅Π½Ρ‚Π°Π»ΡŒΠ½Ρ‹Π΅ Ρ‚Π΅ΠΌΠΏΠ΅Ρ€Π°Ρ‚ΡƒΡ€Π½Ρ‹Π΅ зависимости элСктропроводности (Π² Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π΅ Ρ‚Π΅ΠΌΠΏΠ΅Ρ€Π°Ρ‚ΡƒΡ€ 4,2-293 К) ΠΈ ΠΏΠΎΠ»Π΅Π²Ρ‹Π΅ зависимости магнСтосопротивлСния (Π² полях Π΄ΠΎ 9 Π’Π» ΠΏΡ€ΠΈ Ρ‚Π΅ΠΌΠΏΠ΅Ρ€Π°Ρ‚ΡƒΡ€Π΅ 10 К) ΠΎΠ±Ρ€Π°Π·Ρ†ΠΎΠ² МУНВ с ΠΌΠΎΠ΄ΠΈΡ„ΠΈΡ†ΠΈΡ€ΠΎΠ²Π°Π½Π½Ρ‹ΠΌΠΈ окислСниСм повСрхностными слоями, Π° Ρ‚Π°ΠΊΠΆΠ΅ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡ‚ΠΎΠ² Π½Π° ΠΈΡ… основС. УстановлСно, Ρ‡Ρ‚ΠΎ окислСниС повСрхностных слоСв МУНВ Π² растворах кислот Π²Π΅Π΄Π΅Ρ‚ ΠΊ измСнСнию Ρ‚Π΅ΠΌΠΏΠ΅Ρ€Π°Ρ‚ΡƒΡ€Π½Ρ‹Ρ… зависимостСй элСктропроводности. Π’Π²Π΅Π΄Π΅Π½ΠΈΠ΅ МУНВ Π² Π΄ΠΈΡΠ»Π΅ΠΊΡ‚Ρ€ΠΈΡ‡Π΅ΡΠΊΡƒΡŽ ΠΌΠ°Ρ‚Ρ€ΠΈΡ†Ρƒ ΠΏΠΎΠ»ΠΈΠΌΠ΅Ρ‚ΠΈΠ»ΠΌΠ΅Ρ‚Π°ΠΊΡ€ΠΈΠ»Π°Ρ‚Π° (ПММА) ΠΏΡ€ΠΈΠ²ΠΎΠ΄ΠΈΡ‚ ΠΊ Ρ‚Π΅ΠΌΠΏΠ΅Ρ€Π°Ρ‚ΡƒΡ€Π½ΠΎΠΉ зависимости проводимости, Π±Π»ΠΈΠ·ΠΊΠΎΠΉ ΠΊ Ρ‚ΠΈΠΏΠΈΡ‡Π½ΠΎΠΉ для ΠΏΡ€Ρ‹ΠΆΠΊΠΎΠ²ΠΎΠΉ проводимости с ΠΏΠ΅Ρ€Π΅ΠΌΠ΅Π½Π½ΠΎΠΉ Π΄Π»ΠΈΠ½ΠΎΠΉ ΠΏΡ€Ρ‹ΠΆΠΊΠ° для Ρ‚Ρ€Π΅Ρ…ΠΌΠ΅Ρ€Π½ΠΎΠ³ΠΎ случая.In this paper we consider the effect of oxidative treatments on the properties of multiwalled carbon nan- otubes (MWNT). The experimental temperature dependence of electrical conductivity (in the temperature range 4,2-293 K) and field dependence of magnetoresistance (in fields up to 9 Tl at 10 K) of the samples with MWCNT modified by oxidation of the surface layers, as well as the composites based on them. It was established that the oxidation of the surface layers of MWCNTs in acid solutions leads to a change in the temperature dependence of electrical conductivity. Introduction of MWCNTs in a dielectric matrix of polymethylmethacrylate (PMMA) leads to the dependence of the conductivity close to that typical for hopping conductivity with variable hopping length, three-dimensional case

    Influence of the Dielectric Matrix on the Electrical Nanocomposites Based on Oxidized Multi-Walled Carbon Nanotubes

    No full text
    Π’ Π΄Π°Π½Π½ΠΎΠΉ Ρ€Π°Π±ΠΎΡ‚Π΅ рассмотрСно влияниС ΠΎΠΊΠΈΡΠ»ΠΈΡ‚Π΅Π»ΡŒΠ½Ρ‹Ρ… ΠΎΠ±Ρ€Π°Π±ΠΎΡ‚ΠΎΠΊ Π½Π° свойства многослойных ΡƒΠ³Π»Π΅Ρ€ΠΎΠ΄Π½Ρ‹Ρ… Π½Π°Π½ΠΎΡ‚Ρ€ΡƒΠ±ΠΎΠΊ (МУНВ). РассмотрСны ΡΠΊΡΠΏΠ΅Ρ€ΠΈΠΌΠ΅Π½Ρ‚Π°Π»ΡŒΠ½Ρ‹Π΅ Ρ‚Π΅ΠΌΠΏΠ΅Ρ€Π°Ρ‚ΡƒΡ€Π½Ρ‹Π΅ зависимости элСктропроводности (Π² Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π΅ Ρ‚Π΅ΠΌΠΏΠ΅Ρ€Π°Ρ‚ΡƒΡ€ 4,2-293 К) ΠΈ ΠΏΠΎΠ»Π΅Π²Ρ‹Π΅ зависимости магнСтосопротивлСния (Π² полях Π΄ΠΎ 9 Π’Π» ΠΏΡ€ΠΈ Ρ‚Π΅ΠΌΠΏΠ΅Ρ€Π°Ρ‚ΡƒΡ€Π΅ 10 К) ΠΎΠ±Ρ€Π°Π·Ρ†ΠΎΠ² МУНВ с ΠΌΠΎΠ΄ΠΈΡ„ΠΈΡ†ΠΈΡ€ΠΎΠ²Π°Π½Π½Ρ‹ΠΌΠΈ окислСниСм повСрхностными слоями, Π° Ρ‚Π°ΠΊΠΆΠ΅ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡ‚ΠΎΠ² Π½Π° ΠΈΡ… основС. УстановлСно, Ρ‡Ρ‚ΠΎ окислСниС повСрхностных слоСв МУНВ Π² растворах кислот Π²Π΅Π΄Π΅Ρ‚ ΠΊ измСнСнию Ρ‚Π΅ΠΌΠΏΠ΅Ρ€Π°Ρ‚ΡƒΡ€Π½Ρ‹Ρ… зависимостСй элСктропроводности. Π’Π²Π΅Π΄Π΅Π½ΠΈΠ΅ МУНВ Π² Π΄ΠΈΡΠ»Π΅ΠΊΡ‚Ρ€ΠΈΡ‡Π΅ΡΠΊΡƒΡŽ ΠΌΠ°Ρ‚Ρ€ΠΈΡ†Ρƒ ΠΏΠΎΠ»ΠΈΠΌΠ΅Ρ‚ΠΈΠ»ΠΌΠ΅Ρ‚Π°ΠΊΡ€ΠΈΠ»Π°Ρ‚Π° (ПММА) ΠΏΡ€ΠΈΠ²ΠΎΠ΄ΠΈΡ‚ ΠΊ Ρ‚Π΅ΠΌΠΏΠ΅Ρ€Π°Ρ‚ΡƒΡ€Π½ΠΎΠΉ зависимости проводимости, Π±Π»ΠΈΠ·ΠΊΠΎΠΉ ΠΊ Ρ‚ΠΈΠΏΠΈΡ‡Π½ΠΎΠΉ для ΠΏΡ€Ρ‹ΠΆΠΊΠΎΠ²ΠΎΠΉ проводимости с ΠΏΠ΅Ρ€Π΅ΠΌΠ΅Π½Π½ΠΎΠΉ Π΄Π»ΠΈΠ½ΠΎΠΉ ΠΏΡ€Ρ‹ΠΆΠΊΠ° для Ρ‚Ρ€Π΅Ρ…ΠΌΠ΅Ρ€Π½ΠΎΠ³ΠΎ случая.In this paper we consider the effect of oxidative treatments on the properties of multiwalled carbon nan- otubes (MWNT). The experimental temperature dependence of electrical conductivity (in the temperature range 4,2-293 K) and field dependence of magnetoresistance (in fields up to 9 Tl at 10 K) of the samples with MWCNT modified by oxidation of the surface layers, as well as the composites based on them. It was established that the oxidation of the surface layers of MWCNTs in acid solutions leads to a change in the temperature dependence of electrical conductivity. Introduction of MWCNTs in a dielectric matrix of polymethylmethacrylate (PMMA) leads to the dependence of the conductivity close to that typical for hopping conductivity with variable hopping length, three-dimensional case
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