Double functions of porous TiO2 electrodes on CH3NH3PbI3 perovskite solar cells: Enhancement of perovskite crystal transformation and prohibition of short circuiting

Murugadoss, Govindhasamy; Mizuta, Gai; Tanaka, Shinji; Nishino, Hitoshi; Umeyama, Tomokazu; Imahori, Hiroshi; Ito, Seigo

doi:10.1063/1.4891597

Cited by 59 publications

(58 citation statements)

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“…It was confirmed that although inorganic HTM can work effectively as organic HTM, CuSCN can react with CH3NH3PbI3. Therefore, porous TiO2 is necessary to block short circuits [9]. In order to achieve concrete results, further experiments should be done, for example TEM, XPS, SEM, Auger spectroscopy, X-ray absorption fine structure (XASF), and so on.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 3 shows the XRD patterns of the two-step deposition of the CH3NH3PbI3 perovskite crystal with the HTM layer. Due to the procedure of the two-step sequential deposition of the PbI2 crystal into methylammonium iodide solution, some part of the PbI2 can remain [9]. Although the CuSCN XRD peak can remain on the one-step deposited CH3NH3PbI3 (15.8°, in Figure 2), it was found that the peak of CuSCN vanished on the two-step-deposited CH3NH3PbI3 perovskite layer, which may be due to the attack of the excess amount of iodide ion from the PbI2 layer on the CuSCN crystal.…”

Section: Resultsmentioning

confidence: 99%

“…Otherwise, the former material can be dissoluble into the latter one. For example, although CuSCN hole-transporting material (HTM) can work on the CH3NH3PbI3 perovskite layer to be a solar cell [8], the CuSCN and CH3NH3PbI3 perovskite can diffuse into each other and make a short circuit [8,9]. In order to improve the conversion efficiency of perovskite solar cells, this phenomena is a critical issue.…”

Section: Introductionmentioning

confidence: 99%

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Material Exchange Property of Organo Lead Halide Perovskite with Hole-Transporting Materials

et al. 2015

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Using X-ray diffraction (XRD), it was confirmed that the deposition of hole-transporting materials (HTM) on a CH3NH3PbI3 perovskite layer changed the CH3NH3PbI3 perovskite crystal, which was due to the material exchanging phenomena between the CH3NH3PbI3 perovskite and HTM layers. The solvent for HTM also changed the perovskite crystal. In order to suppress the crystal change, doping by chloride ion, bromide ion and 5-aminovaleric acid was attempted. However, the doping was unable to stabilize the perovskite crystal against HTM deposition. It can be concluded that the CH3NH3PbI3 perovskite crystal is too soft and flexible to stabilize against HTM deposition.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Material Exchange Property of Organo Lead Halide Perovskite with Hole-Transporting Materials

et al. 2015

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“…33 Further studies of this sort will be very insightful with respect to the device stability, in particular, if they were to include relevant stressors such as moisture, oxygen, and UV light. A range of inorganic hole-transporter materials were proposed with the aim of improving the device stability, including copper thiocyanate (CuSCN), [34][35][36][37][38][39][40][41] copper iodide (CuI), 42,43 and nickel oxide (NiO x ). 44 The latter for example showed good stability over 60 days, during which control devices with spiro-OMeTAD underwent rapid degradation.…”

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confidence: 99%

Research Update: Strategies for improving the stability of perovskite solar cells

et al. 2016

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The power-conversion efficiency of perovskite solar cells has soared up to 22.1% earlier this year. Within merely five years, the perovskite solar cell can now compete on efficiency with inorganic thin-film technologies, making it the most promising of the new, emerging photovoltaic solar cell technologies. The next grand challenge is now the aspect of stability. The hydrophilicity and volatility of the organic methylammonium makes the work-horse material methylammonium lead iodide vulnerable to degradation through humidity and heat. Additionally, ultraviolet radiation and oxygen constitute stressors which can deteriorate the device performance. There are two fundamental strategies to increasing the device stability: developing protective layers around the vulnerable perovskite absorber and developing a more resilient perovskite absorber. The most important reports in literature are summarized and analyzed here, letting us conclude that any long-term stability, on par with that of inorganic thin-film technologies, is only possible with a more resilient perovskite incorporated in a highly protective device design.

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“…The device showed a slight enhancement in performance to display a PCE of 5.12% and exhibited stability against light soaking without encapsulation. A remarkable improvement under the same configuration was further achieved by the sequential deposition method [129] and preheating substrate before PbI 2 deposition. The efficiency was enhanced to 10.51% because of a pinhole-less perovskite layer which limits the diffusion of CuSCN into the CH 3 NH 3 PbI 3 active layer [130].…”

Section: Meoporous Cuscn-based N-i-p Pscsmentioning

confidence: 82%

Inorganic p-Type Semiconductors: Their Applications and Progress in Dye-Sensitized Solar Cells and Perovskite Solar Cells

Yum

Moon

et al. 2016

Energies

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Considering the increasing global demand for energy and the harmful ecological impact of conventional energy sources, it is obvious that development of clean and renewable energy is a necessity. Since the Sun is our only external energy source, harnessing its energy, which is clean, non-hazardous and infinite, satisfies the main objectives of all alternative energy strategies. With attractive features, i.e., good performance, low-cost potential, simple processibility, a wide range of applications from portable power generation to power-windows, photoelectrochemical solar cells like dye-sensitized solar cells (DSCs) represent one of the promising methods for future large-scale power production directly from sunlight. While the sensitization of n-type semiconductors (n-SC) has been intensively studied, the use of p-type semiconductor (p-SC), e.g., the sensitization of wide bandgap p-SC and hole transport materials with p-SC have also been attracting great attention. Recently, it has been proved that the p-type inorganic semiconductor as a charge selective material or a charge transport material in organometallic lead halide perovskite solar cells (PSCs) shows a significant impact on solar cell performance. Therefore the study of p-type semiconductors is important to rationally design efficient DSCs and PSCs. In this review, recent published works on p-type DSCs and PSCs incorporated with an inorganic p-type semiconductor and our perspectives on this topic are discussed.

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Double functions of porous TiO2 electrodes on CH3NH3PbI3 perovskite solar cells: Enhancement of perovskite crystal transformation and prohibition of short circuiting

Cited by 59 publications

References 18 publications

Material Exchange Property of Organo Lead Halide Perovskite with Hole-Transporting Materials

Material Exchange Property of Organo Lead Halide Perovskite with Hole-Transporting Materials

Research Update: Strategies for improving the stability of perovskite solar cells

Inorganic p-Type Semiconductors: Their Applications and Progress in Dye-Sensitized Solar Cells and Perovskite Solar Cells

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