Organic‐Free and Lead‐Free Perovskite Solar Cells with Efficiency over 11% (Adv. Energy Mater. 42/2022)

Zhang, Weihai; Cai, Yating; Liu, Heng; Xia, Yu; Cui, Jieshun; Shi, Yongjie; Chen, Rui; Shi, Tingting; Wang, Hsing‐Lin

doi:10.1002/aenm.202270174

Cited by 20 publications

(22 citation statements)

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“…The reduced trap‐assisted recombination is intimately linked to the improvement of crystallinity and quality of FAAc film, therefore resulting in higher V oc compared to the control device. [ 28 ] The dark J – V curves of both two devices were shown in Figure S8 (Supporting Information). FAAc devices showed smaller dark current, which implied that FAAc can reduce defects and traps in perovskite films, thus reducing the leakage current.…”

Section: Resultsmentioning

confidence: 99%

Stabilization of Perovskite Lattice and Suppression of Sn²⁺/Sn⁴⁺ Oxidation via Formamidine Acetate for High Efficiency Tin Perovskite Solar Cells

Wang

Yao

Zhu

et al. 2023

Adv Funct Materials

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Tin halide lead‐free perovskite solar cells (TPSCs) have received tremendous research interest recently due to their nearly ideal bandgap, broad light absorption, non‐toxicity, and environmental friendliness. However, the uncontrollable crystallization process and the facile oxidation of Sn2+ limit the further increase of power conversion efficiency (PCE). To solve these problems, a series of acetates are introduced into the perovskite precursor solution to regulate the crystallization process. It is revealed that formamidine acetate (FAAc) has strong COSn coordination with Sn2+ compared with acetic acid (HAc) and methylammonium acetate (MAAc), which can stabilize the lattice structure, minimize defect states and suppress the oxidation of Sn2+. Meanwhile, benefiting from this coordination ability, it not only leads to large‐size colloidal clusters in precursor but also slows down the crystallization process and improves the crystallinity of tin halide perovskite films. The device with FAAc achieved an increased PCE from initially 9.84% to 12.43%, and it could maintain 94% of its initial value for 2000 h in N2 atmosphere. This work provides a feasible strategy for depositing high‐quality tin perovskite films with low defect density and lattice distortion, which will be crucial for related photovoltaics and other optoelectronic devices.

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Section: Resultsmentioning

confidence: 99%

Stabilization of Perovskite Lattice and Suppression of Sn²⁺/Sn⁴⁺ Oxidation via Formamidine Acetate for High Efficiency Tin Perovskite Solar Cells

Wang

Yao

Zhu

et al. 2023

Adv Funct Materials

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“…Recently, Zhang et al. [ 155 ] reported on inorganic Sn‐PSCs based on CsSnI 3− x Br x perovskite films comprising a multifunctional dimethyl ketoxime (C 3 H 7 NO, DMKO) additive. The DMKO antioxidant additive reduced Sn 4+ to Sn 2+ , making the perovskite film more resistant to oxidation.…”

Section: Additive Engineeringmentioning

confidence: 99%

“…This is most likely due to the weaker reducing strength of HBr and HCl relative to HI. In fact, the inclusion of bromide in either a PEA [ 154 ] or Sn‐halide [ 155 ] sources have recently started to appear in the literature. However, further research is required to elucidate the role of halide‐sources on the chemical and physical properties of Sn perovskites.…”

Section: Perspectives and Outlookmentioning

confidence: 99%

Engineering Stable Lead‐Free Tin Halide Perovskite Solar Cells: Lessons from Materials Chemistry

et al. 2023

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demonstrating a lower dependence on fossil fuels. Although crystalline silicon (c-Si) is still the market front runner for PV due to its ideal bandgap for single-junction solar cells, c-Si does not have a readily tunable bandgap. This makes c-Si less suited for indoor PV or multijunction solar cells, which require alternative bandgaps to operate at their peak. In just over a decade of research, perovskite solar cells (PSCs) have emerged as an alternative PV technology which have tuneable bandgaps, low fabrication costs, solution processability, compliancy with flexible materials, long electron-hole diffusion length, and high charge carrier mobility. [2][3][4][5][6][7][8][9] The perovskite absorber layer is based on the ABX 3 crystal structure made up of organic/inorganic monovalent cations (A), a divalent cation (B) and one or more halides (X) as shown in Figure 1a. [10] Since the first publication on PSCs in 2009, the power conversion efficiencies (PCE) have gone from 3.8% to 25.7 %, making PSCs the fastest growing PV technology to date. [11][12][13] Despite their promise, toxic heavy metal element Pb (in the structure's B-site) is still required to achieve highly competitive efficiencies, [14][15][16][17][18][19][20][21][22][23] which is a major obstacle in the field that is yet to be overcome. In contact with moisture and/or light + oxygen lead halide perovskites can easily decompose into watersoluble compounds of lead, [24][25][26][27][28] which then inevitably accumulate within the food chain and therefore have the potential to ingress into the human body. [29] While several low toxicity metal halide alternatives to Pb have been proposed, [30][31][32][33][34][35] the favorable physical and optical properties of Sn make it the most promising substitute. [29,36] The first demonstration of Sn-halide PSCs was in 2014, where Hao et al. and Noel et al. reported 5.7% and 6.4% PCE respectively using methylammonium tin halides as the absorber layers (MAS-nIBr 2 and MASnI 3 , respectively). [30,31] At present, the highest performing Sn-halide PSCs show PCEs of over 14%; Yu et al. reported certified 14.03%-efficient 2D/3D perovskite solar cells, [37] while Jiang et al. achieved a certified PCE of 14.6% via a novel film fabrication route based on SnI 2 adducts (further details will be provided below). [38] To date, most of the progress with Sn-halide perovskites has been made using formamidinium tin iodide (FASnI 3 , see Figure 1b) and closely related recipes. [39][40][41][42][43] The favored use of the FA cation can be attributed to the higher formation energies of Sn vacancies in FASnI 3 and thus a lower hole density in comparison to MASnI 3 . [44] In comparison to their Pb-based counterparts, Sn-halide perovskites Substituting toxic lead with tin (Sn) in perovskite solar cells (PSCs) is the most promising route toward the development of high-efficiency lead-free devices. Despite the encouraging efficiencies of Sn-PSCs, they are still yet to surpass 15% and suffer detrimental oxidation of Sn(II) to Sn(IV). Since their...

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“…However, we didn't observe much change of the Cl 2p and I 3d signals (Figure S10), indicating Ni−Cl and Ni−I interactions are lower than the Ni−Br, as the Br − ions are most negatively charged according to the ESP calculations (Figure 1a). [36, 37] Since both −OH and halide ions could interact with Ni 3+ , we set tyramine (OH‐PEA) as a reference to differentiate their impacts on device performance and the result suggests the paramount role of halide ions (Figure S11).…”

Section: Figurementioning

confidence: 99%

Manipulation of the Buried Interface for Robust Formamidinium‐based Sn−Pb Perovskite Solar Cells with NiO_xHole‐Transport Layers

et al. 2023

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Low band gap tin‐lead perovskite solar cells (Sn−Pb PSCs) are expected to achieve higher efficiencies than Pb‐PSCs and regarded as key components of tandem PSCs. However, the realization of high efficiency is challenged by the instability of Sn2+ and the imperfections at the charge transfer interfaces. Here, we demonstrate an efficient ideal band gap formamidinium (FA)‐based Sn−Pb (FAPb0.5Sn0.5I3) PSC, by manipulating the buried NiOx/perovskite interface with 4‐hydroxyphenethyl ammonium halide (OH‐PEAX, X=Cl−, Br−, or I−) interlayer, which exhibits fascinating functions of reducing the surface defects of the NiOx hole transport layer (HTL), enhancing the perovskite film quality, and improving both the energy level matching and physical contact at the interface. The effects of different halide anions have been elaborated and a 20.53 % efficiency is obtained with OH‐PEABr, which is the highest one for FA‐based Sn−Pb PSCs using NiOx HTLs. Moreover, the device stability is also boosted.

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Organic‐Free and Lead‐Free Perovskite Solar Cells with Efficiency over 11% (Adv. Energy Mater. 42/2022)

Cited by 20 publications

References 0 publications

Stabilization of Perovskite Lattice and Suppression of Sn²⁺/Sn⁴⁺ Oxidation via Formamidine Acetate for High Efficiency Tin Perovskite Solar Cells

Stabilization of Perovskite Lattice and Suppression of Sn²⁺/Sn⁴⁺ Oxidation via Formamidine Acetate for High Efficiency Tin Perovskite Solar Cells

Engineering Stable Lead‐Free Tin Halide Perovskite Solar Cells: Lessons from Materials Chemistry

Manipulation of the Buried Interface for Robust Formamidinium‐based Sn−Pb Perovskite Solar Cells with NiO_xHole‐Transport Layers

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Organic‐Free and Lead‐Free Perovskite Solar Cells with Efficiency over 11% (Adv. Energy Mater. 42/2022)

Cited by 20 publications

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Stabilization of Perovskite Lattice and Suppression of Sn2+/Sn4+ Oxidation via Formamidine Acetate for High Efficiency Tin Perovskite Solar Cells

Stabilization of Perovskite Lattice and Suppression of Sn2+/Sn4+ Oxidation via Formamidine Acetate for High Efficiency Tin Perovskite Solar Cells

Engineering Stable Lead‐Free Tin Halide Perovskite Solar Cells: Lessons from Materials Chemistry

Manipulation of the Buried Interface for Robust Formamidinium‐based Sn−Pb Perovskite Solar Cells with NiOxHole‐Transport Layers

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Stabilization of Perovskite Lattice and Suppression of Sn²⁺/Sn⁴⁺ Oxidation via Formamidine Acetate for High Efficiency Tin Perovskite Solar Cells

Stabilization of Perovskite Lattice and Suppression of Sn²⁺/Sn⁴⁺ Oxidation via Formamidine Acetate for High Efficiency Tin Perovskite Solar Cells

Manipulation of the Buried Interface for Robust Formamidinium‐based Sn−Pb Perovskite Solar Cells with NiO_xHole‐Transport Layers