Hysteresis-free perovskite solar cells made of potassium-doped organometal halide perovskite

Tang, Zeguo; Bessho, Takeru; Awai, Fumiyasu; Kinoshita, Takumi; Maitani, Masato M.; Jono, Ryota; Murakami, Takurou N.; Wang, Haibin; Kubo, Takaya; Uchida, Satoshi; Segawa, Hiroshi

doi:10.1038/s41598-017-12436-x

Cited by 248 publications

(215 citation statements)

References 39 publications

Supporting

Mentioning

193

Contrasting

Order By: Relevance

“…The UV‐vis absorption spectra of K‐MAPbBr 3 in Figure 1B show a slight blue shift compared with the MAPbBr 3 . Such blue shift should be attributed to the doping or alloying of K cation into MAPbBr 3 crystals as suggested by XRD pattern, which is in accordance with previous reports . The X‐ray photoelectron spectra (XPS) were investigated to further reveal the chemical states of MAPbBr 3 and K‐MAPbBr 3 .…”

Section: Resultssupporting

confidence: 88%

“…Such blue shift should be attributed to the doping or alloying of K cation into MAPbBr 3 crystals as suggested by XRD pattern, which is in accordance with previous reports. [15][16][17][18][19] The X-ray photoelectron spectra (XPS) were investigated to further reveal the chemical states of MAPbBr 3 and K-MAPbBr 3 . Two peaks of K 2p in K-MAPbBr 3 confirm the presence of K in MAPbBr 3 sample ( Figure S2).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Potassium stabilization of methylammonium lead bromide perovskite for robust photocatalytic H₂ generation

Yue

Zhang

Yang

et al. 2020

EcoMat

View full text Add to dashboard Cite

Various optoelectronic applications of organic inorganic hybrid lead halide perovskites are challenged by their stability. The photocatalytic stability of lead halide perovskites are so low that chemical stabilizer such as H3PO2 are required in their applications. We report a postsynthesis potassium stabilization on methylammonium lead bromide (MAPbBr3) to form K‐MAPbBr3 by doping K cation and depositing KBr layers. In absence of any stabilizer, this stable K‐MAPbBr3 perovskite can exhibit an unprecedented high photostability even after 200 hours continuous photocatalytic H2 generation. Impressively, the K‐MAPbBr3 cocatalyzed with Mo3S132− nanoclusters achieves a high apparent quantum efficiency up to 18.3% at 450 nm for photocatalytic H2 generation. The mechanism study reveals that the photogeneration of Pb0 and Br0 defects are effectively inhibited in K‐MAPbBr3, which makes it a robust photocatalyst for H2 generation. These findings will inspire the development of stable organic‐inorganic hybrid perovskites for photocatalysis and other optoelectronic applications.

show abstract

Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Potassium stabilization of methylammonium lead bromide perovskite for robust photocatalytic H₂ generation

Yue

Zhang

Yang

et al. 2020

EcoMat

View full text Add to dashboard Cite

show abstract

“…Having witnessed the potential of SWNT-laminated PSCs, we collaborated with Yang and colleauges at UCLA and incorporated a new type of perovskite and the top-SWNT doping. [165,175,176] Although replacing TiO 2 by C 60 greatly improved stability by removing hysteresis, fullerene is still vulnerable to oxidation and will be oxidized by oxygen in the air at some point. Therefore, for SWNTs, it was essential to come up with PSCs in which the perovskite photoactive layer can absorb maximum light before it reaches the top SWNT, and to increase the conductivity of SWNTs via a suitable doping method.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Single‐Walled Carbon Nanotubes in Emerging Solar Cells: Synthesis and Electrode Applications

Jeon

Xiang

Shawky

et al. 2018

Advanced Energy Materials

View full text Add to dashboard Cite

years, because of growing concerns over the energy security. Among different types of photovoltaics, silicon solar cells give power conversion efficiencies (PCEs) of over 26% with excellent durability. This technology has already reached the market, and the products are readily available. However as recent technologies, such as flexible smartphones and IoT (internet of things), evolve into more versatile and portable electronics, there is a shift of demand from performance-centric technologies to versatility-oriented technologies. In other words, the paradigm is shifting to flexible, wearable, and light-weight electronic devices. Energy-generating devices are also following the same path. This means that the thin-film solar cell technologies, such as organic solar cells (OSCs) [1][2][3] and perovskite solar cells (PSCs), [4,5] are considered to be the wave of the future with their critical attributes of being ultrathin (<1 mm), light-weight, and solution-processable. [6] These emerging thin-film solar cells have the potential to equal or surpass the PCE of silicon solar cells while having major advantages in terms of production cost, enhanced design and a variety of new functionalities. Furthermore, tandem photovoltaics, [7] which are combined solar cells of PSCs, silicon solar cells, [8] or OSCs, [9,10] are another new and promising category for the future photovoltaic technology. Despite different names of solar cell types, the device structure is largely the same. They commonly share the typical configuration of one photoactive layer in the center, two charge selective layers above and below the active layer, and two electrodes at each end-at least one of which has to be transparent so that sunlight can pass through it. While there has been an intense efficiency race within the emerging thin-film solar cell community, less attention has been paid to other features, such as flexibility and stability. These traits can be enhanced by using new electrodes and charge-selective layers. Not only the functionalities but also photovoltaic performance is heavily dependent on the electrode and the charge-selective layers. Many scientists around the world, thus far, have focused on these layers by developing novel materials and modifying conventional materials to push the boundaries of current thin-film photovoltaic technology.Abundant and mechanically resilient carbon allotropes are composed of carbon atoms only, yet manifest different electronic properties depending on their configurations and arrangements. Of the carbon species, carbon nanotubes (CNTs) are promising materials to be incorporated into the thin-film solar cells owing to a wide range of properties ranging from conductors to semiconductors with different bandgaps based Emerging solar cells, namely, organic solar cells and perovskite solar cells, are the thin-film photovoltaics that have light to electricity conversion efficiencies close to that of silicon solar cells while possessing advantages in having additional functionalities, facile-processability, an...

show abstract

“…This issue is particularly significant for achieving good performance of the inverted NiO‐based perovskite solar cells with phenyl‐C 61 ‐butyric acid methyl ester (PCBM), for which it is difficult to achieve a favorable energy alignment between the FA‐based mixed perovskite and the PCBM . The energy‐level alignment can also be altered by doping the perovskite layer with other alkali metals, such as potassium or rubidium . Rubidium doping has been shown to stabilize the α‐phase of FA‐based perovskite and results in high‐efficiency devices .…”

Section: Structure Of Fa‐based Perovskitesmentioning

confidence: 99%

Formamidinium‐Based Lead Halide Perovskites: Structure, Properties, and Fabrication Methodologies

Liu

Waqas

et al. 2018

Small Methods

View full text Add to dashboard Cite

Formamidinium (FA)‐based perovskites exhibit great potential for photovoltaics since they enable the achievement of power conversion efficiency (PCE) over 22%. The bandgap of FA‐based perovskite is lower than that of the methylammonium‐based one, while the larger ionic radius and dual‐ammonia group of FA ions restrain their movement in close‐packing [PbI6]4− cages, leading to improved stability. Here, the structure and properties of FAPbI3− and FA‐based mixed cation perovkites are discussed. In particular, the issues of polymorphism and stabilization of the desired low‐bandgap crystal phase of FAPbI3 are considered. FAPbI3 exhibits polymorphisms with a photovoltaically unfavorable δ‐phase that is stable at room temperature, and, thus, it is difficult to prepare continuous and compact FAPbI3 with the desired crystal structure, namely, the pure α‐phase. Hence, overcoming the limitations of phase transitions is the critical issue in obtaining high‐quality FA‐based perovskite films, which are a prerequisite for solar cells with high PCEs. Here, the focus is on the fabrication methods of FA‐based perovskite films, namely, additive engineering, intermolecular exchange, interfacial engineering, and chemical vapor deposition. A comprehensive overview of the fabrication methodology for the FA‐based perovskite films is provided to facilitate understanding of the underlying mechanisms.

show abstract

Hysteresis-free perovskite solar cells made of potassium-doped organometal halide perovskite

Cited by 248 publications

References 39 publications

Potassium stabilization of methylammonium lead bromide perovskite for robust photocatalytic H₂ generation

Potassium stabilization of methylammonium lead bromide perovskite for robust photocatalytic H₂ generation

Single‐Walled Carbon Nanotubes in Emerging Solar Cells: Synthesis and Electrode Applications

Formamidinium‐Based Lead Halide Perovskites: Structure, Properties, and Fabrication Methodologies

Contact Info

Product

Resources

About

Hysteresis-free perovskite solar cells made of potassium-doped organometal halide perovskite

Cited by 248 publications

References 39 publications

Potassium stabilization of methylammonium lead bromide perovskite for robust photocatalytic H2 generation

Potassium stabilization of methylammonium lead bromide perovskite for robust photocatalytic H2 generation

Single‐Walled Carbon Nanotubes in Emerging Solar Cells: Synthesis and Electrode Applications

Formamidinium‐Based Lead Halide Perovskites: Structure, Properties, and Fabrication Methodologies

Contact Info

Product

Resources

About

Potassium stabilization of methylammonium lead bromide perovskite for robust photocatalytic H₂ generation

Potassium stabilization of methylammonium lead bromide perovskite for robust photocatalytic H₂ generation