Effects of Cu addition to perovskite CH 3 NH 3 PbI 3− x Cl x photovoltaic devices with hot airflow during spin-coating

International Journal of Photoenergy

Nomura

Suzuki

et al. 2018

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Effects of polysilane additions on CH3NH3PbI3 perovskite solar cells were investigated. Photovoltaic cells were fabricated by a spin-coating method using perovskite precursor solutions with polymethyl phenylsilane, polyphenylsilane, or decaphenyl cyclopentasilane (DPPS), and the microstructures were examined by X-ray diffraction and optical microscopy. Open-circuit voltages were increased by introducing these polysilanes, and short-circuit current density was increased by the DPPS addition, which resulted in the improvement of the photoconversion efficiencies to 10.46%. The incident photon-to-current conversion efficiencies were also increased in the range of 400~750 nm. Microstructure analysis indicated the formation of a dense interfacial structure by grain growth and increase of surface coverage of the perovskite layer with DPPS, and the formation of PbI2 was suppressed, leading to the improvement of photovoltaic properties.

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of CH₃NH₃PbI₃ Perovskite Solar Cells Added with Polysilanes

International Journal of Photoenergy

Nomura

Suzuki

et al. 2018

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“…[5][6][7][8] In previous studies, it was reported that the addition of Cu compounds to perovskite precursor solutions in methylammonium (MA) and Cs-based perovskite solar cells contributed to increases in grain sizes and preferred crystal orientations, resulting in enhanced device properties. [9][10][11][12][13] These improvements in the film qualities of the perovskite compounds were attributed to the introduction of Cu, which delayed the growth rate of perovskite crystals. 14) Co-addition of Cu and alkali metals to MA-based perovskite has also been reported to enhance photovoltaic properties [15][16][17][18] or device stabilities.…”

Section: Introductionmentioning

confidence: 99%

First-principles calculation analysis and photovoltaic properties of Cu compound-added perovskite solar cells

Okumura

Suzuki

et al. 2023

Jpn. J. Appl. Phys.

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Experiments and first-principles calculations were performed to investigate the effects of Cu substitution in CH3NH3PbI3 perovskite crystals. The first-principles calculations indicated that the energy level of the Cu d orbital formed above the VB maximum would be an acceptor or defect level. The effect of Cu addition on device properties was investigated, and the device with added 2% Cu provided higher efficiencies than the standard device. On the other hand, the decrease in short-circuit current density with increasing Cu content would be attributed to the defect level of the Cu d orbitals. First-principles calculations and experimental results provided insight into the function of Cu in CH3NH3-based perovskite crystals.

“…The performances of photovoltaic devices are strongly dependent on the atomic structures and elemental compositions of the perovskite halide crystals [6,39,40]. Doping some elements such as tin (Sn) [41][42][43][44][45], antimony (Sb) [46][47][48], copper (Cu) [49][50][51][52][53][54][55], arsenic (As) [56], germanium (Ge) [57][58][59], zinc (Zn) [59][60][61][62], manganese (Mn) [63,64], yttrium (Y) [64], strontium (Sr) [65], indium (In) [58], cobalt (Co) [38,66], europium (Eu) [67], thallium (Tl) [58], or bismuth (Bi) [68] at the lead (Pb) site has been attempted and investigated. The photoconversion ranges of the per-ovskite devices have been expanded by introducing Sn or Tl [41,58].…”

Section: Introductionmentioning

confidence: 99%

Crystal structures of perovskite halide compounds used for solar cells

Reviews on Advanced Materials Science

2020

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103

AbstractThe crystal structures of various types of perovskite halide compounds were summarized and described. Atomic arrangements of these perovskite compounds can be investigated by X-ray diffraction and transmission electron microscopy. Based on the structural models of basic perovskite halides, X-ray and electron diffractions were calculated and discussed to compare with the experimental data. Other halides such as elemental substituted or cation ordered double perovskite compounds were also described. In addition to the ordinary 3-dimensional perovskites, low dimensional perovskites with 2-, 1-, or 0-dimensionalities were summarized. The structural stabilities of the perovskite halides could be investigated computing the tolerance and octahedral factors, which can be useful for the guideline of elemental substitution to improve the structures and properties, and several low toxic halides were proposed. For the device conformation, highly crystalline-orientated grains and dendritic structures can be formed and affected the photo-voltaic properties. The actual crystal structures of perovskite halides in the thin film configuration were studied by Rietveld analysis optimizing the atomic coordinates and occupancies with low residual factors. These results are useful for structure analysis of perovskite halide crystals, which are expected to be next-generation solar cell materials.