All-solid-state hybrid solar cells based on a new organometal halide perovskite sensitizer and one-dimensional TiO2 nanowire arrays

Qiu, Jianhang; Qiu, Yongcai; Yan, Keyou; Zhong, Min; Mu, Cheng; Yan, He; Yang, Shihe

doi:10.1039/c3nr00218g

Cited by 404 publications

(315 citation statements)

References 25 publications

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“…From the intersections of dotted lines, the bandgaps of the layers were determined, and are summarized in Table 3. The bandgaps were close to those of previous reports ranging from 1.57 to 1.63 eV 4), 25) and from 2.2 to 2.8 eV 15)18) for CH 3 NH 3 PbI 3 and BiFeO 3 , respectively. The E g values of these layers in both devices were almost same.…”

Section: Resultssupporting

confidence: 74%

“…2. The diffraction peaks at 22.5, 31.9 and 32.0°corresponded to those of BiFeO 3 , indicating that the BiFeO 3 was polycrystalline with a rhombohedral structure (space group R 3c) The BiFeO 3 was singlephase since the XRD patterns showed no impurity phase such as Bi 2 Fe 4 O 9 and Bi 25 FeO 39 . The diffraction peaks of the CH 3 NH 3 PbI 3 layers were observed regardless of different preparation steps, and can be indexed by a cubic crystal system.…”

Section: Resultsmentioning

confidence: 99%

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Fabrication and characterization of bismuth ferrite as an electron transport layer in perovskite photovoltaic devices

Shirahata

Suzuki

Oku

2016

J. Ceram. Soc. Japan

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BiFeO 3 thin films were fabricated by a simple spin-coating method as an electron transport layer in CH 3 NH 3 PbI 3 -based photovoltaic devices. Single-phase BiFeO 3 was obtained, which was confirmed by X-ray diffraction. To characterize photovoltaic properties, BiFeO 3 /CH 3 NH 3 PbI 3 -based photovoltaic devices were fabricated by different preparation steps for CH 3 NH 3 PbI 3 layer, and current densityvoltage characteristics of the photovoltaic devices showed rectifying behaviors. Comparing with the BiFeO 3 /CH 3 NH 3 PbI 3 photovoltaic device fabricated by a 1-step method, the conversion efficiency of the device fabricated by a 2-step method was improved. Bandgaps of the BiFeO 3 and CH 3 NH 3 PbI 3 layers were also determined from optical absorption measurements.

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Section: Resultssupporting

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Fabrication and characterization of bismuth ferrite as an electron transport layer in perovskite photovoltaic devices

Shirahata

Suzuki

Oku

2016

J. Ceram. Soc. Japan

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“…Tauc plots are commonly misused to determine the bandgap from the optical absorption spectra of MAPbI 3 samples that violate the multiple assumptions made in the original work on amorphous Si and Ge. 179,180 These include diffuse light scattering on large sample grains, 181,182 excitonic effects, 175 sub-bandgap defect states and other effects that make the fitting of a tangent to the onset of absorption ambiguous. High quality optical measurements, 183 or at least semi-logarithmic data visualization are important to achieve best practice for experimental bandgap determination.…”

Section: Complementary Techniques To Photoemission Spectroscopymentioning

confidence: 99%

Perovskite-Inspired Photovoltaic Materials: Toward Best Practices in Materials Characterization and Calculations

et al. 2017

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ABSTRACT:Recently, there has been an explosive growth in research based on hybrid lead-halide perovskites for photovoltaics owing to rapid improvements in efficiency. The advent of these materials for solar applications has led to widespread interest in understanding the key enabling properties of these materials. This has resulted in renewed interest in related compounds and a search for materials that may replicate the defect-tolerant properties and long lifetimes of the hybrid lead-halide perovskites. Given the rapid pace of development of the field, the rises in efficiencies of these systems have outpaced the more basic understanding of these materials. Measuring or calculating the basic properties, such as crystal/electronic structure and composition, can be challenging because some of these materials have anisotropic structures, and/or are composed of both heavy metal cations and volatile, mobile, light elements. Some consequences are beam damage during characterization, composition change under vacuum, or compound effects, such as the alteration of the electronic structure through the influence of the substrate. These effects make it challenging to understand the basic properties integral to optoelectronic operation. Compounding these difficulties is the rapid pace with which the field progresses. This has created an ongoing need to continually evaluate best practices with respect to characterization and calculations, as well as to identify inconsistencies in reported values to determine if those inconsistencies are rooted in characterization methodology or materials synthesis. This article describes the difficulties in characterizing hybrid lead-halide perovskites and new materials, and how these challenges may be overcome. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 challenges discussed. The focus in this article is on crystallography, composition measurements, photoemission spectroscopy and calculations on perovskites and new, related absorbers. We suggest how some of the important artifacts could be avoided and how the reporting for each technique could be streamlined between groups to ensure reproducibility as the field progresses.

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“…ybrid organic-inorganic all-solid-state solar cells based on methylammonium lead halide perovskite absorbers are currently attracting increasing interest because of their ease of fabrication and performances rivalling the best thin-film photovoltaic devices [1][2][3][4][5][6][7] . Of the various types of perovskites and morphologies reported to date, CH 3 NH 3 PbI 3 deposited on a mesoporous film of titanium dioxide through a sequential deposition method appears to yield the best certified conversion efficiency 1 .…”

mentioning

confidence: 99%

Unravelling the mechanism of photoinduced charge transfer processes in lead iodide perovskite solar cells

et al. 2014

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Lead halide perovskites have recently been used as light absorbers in hybrid organic-inorganic solid-state solar cells, with efficiencies as high as 15% and open-circuit voltages of 1 V. However, a detailed explanation of the mechanisms of operation within this photovoltaic system is still lacking. Here, we investigate the photoinduced charge transfer processes at the surface of the perovskite using time-resolved techniques. Transient laser spectroscopy and microwave photoconductivity measurements were applied to TiO 2 and Al 2 O 3 mesoporous films impregnated with CH 3 NH 3 PbI 3 perovskite and the organic hole-transporting material spiro-OMeTAD. We show that primary charge separation occurs at both junctions, with TiO 2 and the hole-transporting material, simultaneously, with ultrafast electron and hole injection taking place from the photoexcited perovskite over similar timescales. Charge recombination is shown to be significantly slower on TiO 2 than on Al 2 O 3 films.

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All-solid-state hybrid solar cells based on a new organometal halide perovskite sensitizer and one-dimensional TiO2 nanowire arrays

Cited by 404 publications

References 25 publications

Fabrication and characterization of bismuth ferrite as an electron transport layer in perovskite photovoltaic devices

Fabrication and characterization of bismuth ferrite as an electron transport layer in perovskite photovoltaic devices

Perovskite-Inspired Photovoltaic Materials: Toward Best Practices in Materials Characterization and Calculations

Unravelling the mechanism of photoinduced charge transfer processes in lead iodide perovskite solar cells

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