am9b18197_si_001.pdf (4.84 MB)
Consistently High Voc Values in p‑i‑n Type Perovskite Solar Cells Using Ni3+-Doped NiO Nanomesh as the Hole Transporting Layer
journal contribution
posted on 2020-02-25, 17:38 authored by Ujwal K. Thakur, Pawan Kumar, Sergey Gusarov, Alexander E. Kobryn, Saralyn Riddell, Ankur Goswami, Kazi M. Alam, Spencer Savela, Piyush Kar, Thomas Thundat, Alkiviathes Meldrum, Karthik ShankarLeading edge p-i-n type halide perovskite solar cells (PSCs) severely
underperform n-i-p PSCs. p-i-n type PSCs that use PEDOT:PSS hole transport
layers (HTLs) struggle to generate open-circuit photovoltage values
higher than 1 V. NiO HTLs have shown greater promise in achieving
high Voc values albeit inconsistently.
In this report, a NiO nanomesh with Ni3+ defect grown by
the hydrothermal method was used to obtain PSCs with Voc values that consistently exceeded 1.10 V (champion Voc = 1.14 V). A champion device photoconversion
efficiency of 17.75% was observed. Density functional theory modeling
was used to understand the interfacial properties of the NiO/perovskite
interface. The PCE of PSCs constructed using the Ni3+-doped
NiO nanomesh HTL was ∼34% higher than that of conventional
compact NiO-based perovskite solar cells. A suite of characterization
techniques such as transmission electron microscopy, field emission
scanning electron microscopy, intensity-modulated photocurrent spectroscopy,
intensity-modulated photovoltage spectroscopy, time-resolved photoluminescence,
steady-state photoluminescence, and Kelvin probe force microscopy
provided evidence of better film quality, enhanced charge transfer,
and suppressed charge recombination in PSCs based on hydrothermally
grown NiO nanostructures.
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NiO-based perovskiteedge p-i-n type halide perovskitecharacterization techniquesopen-circuit photovoltage valueschampion V occharge recombinationtime-resolved photoluminescenceDoped NiO Nanomeshp-i-n type PSCscharge transferPCEPEDOTn-i-p PSCschampion device photoconversion efficiencyfield emission scanning electron microscopyNiO HTLs1.10 VNiO nanomesh HTLintensity-modulated photovoltage spectroscopy1 Vhydrothermal methodtransmission electron microscopyfilm quality1.14 Vintensity-modulated photocurrent spectroscopyNiO nanomeshNiO nanostructuresKelvin probe force microscopytheory modelingV oc valuesHigh V oc Values
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