Experimental investigation of the Ag–Bi–I ternary system and thermodynamic properties of the ternary phases

Машадиева, Л. Ф.; Aliev, Ziya S.; Shevelkov, Аndrei V.; Бабанлы, М. Б.

doi:10.1016/j.jallcom.2012.11.033

Cited by 52 publications

(86 citation statements)

References 8 publications

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“…Therefore, other structures of bismuth halides may be more advantageous in solar cells and recently it was reported that the silver bismuth‐halide material AgBi 2 I 7 functions as a photovoltaic material, and solar cells with over 1 % PCE could be obtained . Moreover, BiI 3 shows promising efficiency in solar cells and other bismuth‐halide materials show interesting properties that may be useful in solar cells . A screening of different Ag 1‐3 x Bi 1+ x I4 (0< x <0.19) compounds has previously been performed, indicating that there exist several stable compositions and the structure is not trivial owing to the vacancies in the system …”

Section: Figurementioning

confidence: 99%

“…Figure d shows the diffraction pattern of the AgI/BiI 3 samples made from solutions with molar ratio 1:2 with a layer of the hole‐transport material P3HT on the silver bismuth iodide material, Figure e shows AgI/BiI 3 samples made from solutions with molar ratio 1:2 without P3HT, Figure f shows AgI/BiI 3 samples made from solutions with molar ratio 2:1 with a layer of P3HT, and Figure g shows AgI/BiI 3 samples made from solutions with molar ratio 2:1 without P3HT. The hole‐transport material P3HT protects the sample from degradation, which is clearly seen in the intensity difference of the diffraction peaks when comparing the samples with and without P3HT in Figure 1 d, e as well as in Figure f, g. The sample with the 2:1 molar ratio solution in Figure f matches very well a hexagonal (trigonal) structure with the space group R

\overset{3}{true}

m and cell parameters of a =4.350 Å and c =20.82 Å . The diffraction planes for the strongest diffraction peaks are marked in the Figure .…”

Section: Figurementioning

confidence: 99%

“…The hole‐transport material P3HT protects the sample from degradation, which is clearly seen in the intensity difference of the diffraction peaks when comparing the samples with and without P3HT in Figure 1 d, e as well as in Figure f, g. The sample with the 2:1 molar ratio solution in Figure f matches very well a hexagonal (trigonal) structure with the space group R

\overset{3}{true}

m and cell parameters of a =4.350 Å and c =20.82 Å . The diffraction planes for the strongest diffraction peaks are marked in the Figure . The highest intensity comes from the (104) and (003) planes corresponding to a spacing of d= 3.06 Å and d= 6.97 Å, respectively.…”

Section: Figurementioning

confidence: 99%

See 2 more Smart Citations

High Photon‐to‐Current Conversion in Solar Cells Based on Light‐Absorbing Silver Bismuth Iodide

2017

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Here, a lead‐free silver bismuth iodide (AgI/BiI3) with a crystal structure with space group R true3‾ m is investigated for use in solar cells. Devices based on the silver bismuth iodide deposited from solution on top of TiO2 and the conducting polymer poly(3‐hexylthiophene‐2,5‐diyl) (P3HT) as a hole‐transport layer are prepared and the photovoltaic performance is very promising with a power conversion efficiency over 2 %, which is higher than the performance of previously reported bismuth‐halide materials for solar cells. Photocurrent generation is observed between 350 and 700 nm, and the maximum external quantum efficiency is around 45 %. The results are compared to solar cells based on the previously reported material AgBi2I7, and we observe a clearly higher performance for the devices with the new silver and bismuth iodides composition and different crystal structure. The X‐ray diffraction spectrum of the most efficient silver bismuth iodide material shows a hexagonal crystal structure with space group R true3‾ m, and from the light absorption spectrum we obtain an indirect band gap energy of 1.62 eV and a direct band gap energy of 1.85 eV. This report shows the possibility for finding new structures of metal‐halides efficient in solar cells and points out new directions for further exploration of lead‐free metal‐halide solar cells.

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Section: Figurementioning

confidence: 99%

\overset{3}{true}

m and cell parameters of a =4.350 Å and c =20.82 Å . The diffraction planes for the strongest diffraction peaks are marked in the Figure .…”

Section: Figurementioning

confidence: 99%

\overset{3}{true}

Section: Figurementioning

confidence: 99%

See 1 more Smart Citation

High Photon‐to‐Current Conversion in Solar Cells Based on Light‐Absorbing Silver Bismuth Iodide

2017

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“…[9,13] Of these, AgBi 2 I 7 was found to be energetically unfavorable. [9,13] Of these, AgBi 2 I 7 was found to be energetically unfavorable.…”

mentioning

confidence: 99%

“…[14] The apparent phase with nominal composition AgBi 2 I 7 was concluded to be an Ag-deficient AgBiI 4 (inset, Figure 1b), otherwise it would lead to an unphysically short Bi-I bond length. [13] Recent work by Jung et al suggested that only Ag 2 BiI 5 can be formed by solid-state reaction and is independent of precursor compositions. [13] Recent work by Jung et al suggested that only Ag 2 BiI 5 can be formed by solid-state reaction and is independent of precursor compositions.…”

mentioning

confidence: 99%

Superior Performance of Silver Bismuth Iodide Photovoltaics Fabricated via Dynamic Hot‐Casting Method under Ambient Conditions

Ghosh

Guo

et al. 2018

Advanced Energy Materials

136

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Solution-processed lead halide perovskites have established themselves as one of the most important absorber materials in solar cells with power conversion efficiencies now exceeding 22%. [1] Unfortunately, the over reliance on highly toxic Pb 2+ remains a key issue for widespread commercial applications. The significant concentration of Pb 2+ in high performing halide perovskites and its water solubility make it highly hazardous compound to the environment. [2] Another apparent issue is the inherent instability of lead-based halide perovskites in ambient atmosphere. [3] Although the stability of Pb-based halide perovskites has improved impressively in recent times along with the simultaneous development of passivation techniques, the fabrication of lead-based halide perovskites still requires stringent environmental control. [4] To address these potential issues, there is an increased interest toward leadfree halide perovskites and their analogues in photovoltaics. Replacing Pb 2+ with Sn 2+ or Ge 2+ could minimize the toxicity associated with lead-based halide perovskite; however, the increased environmental instability of these compounds poses significant challenges in solar cell development. [5] Even after incorporating 2D/3D mixtures of perovskites, the efficiency of the highest performing Sn-based system reduced to nearly 50% of its original value within 3 d under 20% humidity. [6] Considering atmospheric stability, trivalent cations such as bismuth and antimony-based ternary halides were also investigated as potential absorber materials due to their inherent atmospheric stability and low toxicity. [7] The incorporation of protonated cations such as MA or Cs with Bi-I octahedra forms Bi-based ternary halides (structural formula A 3 Bi 2 I 9 : A = Cs, MA) exhibits high absorption coefficients and facile solution processability. Nevertheless, the photovoltaic performances of Bi-based ternary halides remained poor mostly due to high optical bandgap and low electronic dimensionality. [8] Replacement of the A-site protonated cations with transition metals such as Ag or Cu is a promising strategy to improve the dimensionality. These transition metals also take part in bonding with Bi-I octahedra, resulting in complex halide bismuthates. In comparison to Bismuth-based ternary halides have recently gained a lot of attention as lead-free perovskite materials. However, photovoltaic performances of these devices remain poor, mostly due to their low-dimensional crystal structure and large bandgap. Here, a dynamic hot casting technique to fabricate silver bismuth iodide-based perovskite solar cells under an ambient atmosphere with power conversion efficiencies above 2.5% is demonstrated. Silver bismuth iodides are 3D analogs of complex ternary bismuth halides with a suitable bandgap for a single junction solar cell. As far as it is known, these results represent the highest efficiency for solution processed air-stable lead-free perovskite solar cells. The enhanced solar cell performance via this dynamic hot casting ...

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Rudorffites and Beyond: Perovskite‐Inspired Silver/Copper Pnictohalides for Next‐Generation Environmentally Friendly Photovoltaics and Optoelectronics

Chakraborty

Pai

Zhao

et al. 2022

Adv Funct Materials

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In the wake of lead-halide perovskite research, bismuth-and antimony-based perovskite-inspired semiconducting materials are attracting increasing attention as safer and potentially more robust alternatives to lead-based archetypes. Of particular interest are the group IB-group VA halide compositions with a generic formula A x B y X x+3y (A + = Cu + /Ag + ; B 3+ = Bi 3+ /Sb 3+ ; X -= I -/Br -), i.e., silver/copper pnictohalides and derivatives thereof. This family of materials forms 3D structures with much higher solar cell efficiencies and greater potential for indoor photovoltaics than the lower-dimensional bismuth/ antimony-based perovskite-inspired semiconductors. Furthermore, silver/ copper pnictohalides are being investigated for applications beyond photovoltaics, e.g., for photodetection, ionization radiation detection, memristors, and chemical sensors. Such versatility parallels the wide range of possible compositions and synthetic routes, which enable various structural, morphological, and optoelectronic properties. This manuscript surveys the growing research on silver/copper pnictohalides, highlighting their composition-structure-property relationships and the status and prospects of the photovoltaic and optoelectronic devices based thereon. The authors hope that the insights provided herein might accelerate the development of eco-friendly and stable perovskiteinspired materials for next-generation photovoltaics and optoelectronics.

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Experimental investigation of the Ag–Bi–I ternary system and thermodynamic properties of the ternary phases

Cited by 52 publications

References 8 publications

High Photon‐to‐Current Conversion in Solar Cells Based on Light‐Absorbing Silver Bismuth Iodide

High Photon‐to‐Current Conversion in Solar Cells Based on Light‐Absorbing Silver Bismuth Iodide

Superior Performance of Silver Bismuth Iodide Photovoltaics Fabricated via Dynamic Hot‐Casting Method under Ambient Conditions

Rudorffites and Beyond: Perovskite‐Inspired Silver/Copper Pnictohalides for Next‐Generation Environmentally Friendly Photovoltaics and Optoelectronics

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