Zn-doping for reduced hysteresis and improved performance of methylammonium lead iodide perovskite hybrid solar cells

Zhao, Wangen; Yang, Dong; Yang, Zhou; Liu, Shengzhong

doi:10.1016/j.mtener.2017.06.009

Cited by 77 publications

(66 citation statements)

References 43 publications

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“…The device based on the perovskite film with 0.1% Zn 2+ shows a significant improvement on all the metrics, yielding J SC = 19.30 mA/cm 2 , V OC = 1.04 V, FF = 68.6%, and PCE = 13.76%. This improvement due to addition of Zn 2+ is consistent with a previous report that demonstrated a superior solar cell performance of Zn-doped perovskite [16]. As expected, the devices with Fe 2+ additives show poor performance because of the non-radiative defects introduced by the Fe-based impurities.…”

Section: Resultssupporting

confidence: 92%

Enhanced Grain Size and Crystallinity in CH3NH3PbI3 Perovskite Films by Metal Additives to the Single-Step Solution Fabrication Process

et al. 2018

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Methods of obtaining large grain size and high crystallinity in absorber materials play an important role in fabrication of high-performance methylammonium lead iodide (MAPbI3) perovskite solar cells. Here we study the effect of adding small concentrations of Cd2+, Zn2+, and Fe2+salts to the perovskite precursor solution used in the single-step solution fabrication process. Enhanced grain size and crystallinity in MAPbI3 films were obtained by using 0.1% of Cd2+ or Zn2+in the precursor solution. Consequently, solar cells constructed with Cd- and Zn-doped perovskite films show a significant improvement in device performance. These results suggest that the process may be an effective and facile method to fabricate high-efficiency perovskite photovoltaic devices.

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Section: Resultssupporting

confidence: 92%

Enhanced Grain Size and Crystallinity in CH3NH3PbI3 Perovskite Films by Metal Additives to the Single-Step Solution Fabrication Process

et al. 2018

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“…For the IIB elements in the ds region, ZnI 2 , ZnCl 2 , CdCl 2 , and HgI 2 significantly upgrade the quality of perovskite films mainly by increasing the grain size, thereby enhancing the photovoltaic performance. As shown in Figure g, they, represented by Zn 2+ , may have few effects on the band structure of perovskites.…”

Section: Metal Cations In the Ds Regionmentioning

confidence: 99%

Metal Cations in Efficient Perovskite Solar Cells: Progress and Perspective

et al. 2019

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dramatically stimulate the development of perovskite solar cells (PVSCs). Benefiting from the constant optimization of functional materials and preparation methods, the power conversion efficiency (PCE) of PVSCs has skyrocketed from 3.8% [15] to a certified value of 24.2% [16] in several years, on a par with the commercialized photovoltaics such as thin-film CdTe and silicon solar cells. [17] In general, the 3D metal halide perovskites possess an ABX 3 structure, where A is a monovalent cation, B is a divalent metal cation, and X is a monovalent halide anion. The ionic radius have to meet the requirement of Goldschmidt's empirical tolerance factor ( (where r is the ionic radius, 0.8 < t < 1) to maintain the 3D perovskite framework. [18,19] For photovoltaic applications, the A-site typically utilizes methylammonium (MA + ), formamidine (FA + ) or Cs + , B can be Pb 2+ or Sn 2+ and X is Br − or I − . Among them, each cxombination can individually form a photoactive perovskite phase and most of the milestone PCEs were attained by mixing the composition of MA/FA/Cs cations and I/Br anions. [20][21][22][23][24][25][26] Beyond all doubt, the properties of perovskite, such as morphology, crystallinity, and trap-state density, have a major influence on the photovoltaic performance of PVSCs. For instance, the photovoltage mainly stems from the splitting of the quasi-Fermi levels in perovskite under illumination. [27,28] Moreover, trap states generated by undercoordinated atoms can trigger nonradiative recombination, ion migration and stability issues. [29] Therefore, various strategies focusing on preparation methods, [30,31] additive engineering [32] and interface modification [33][34][35] have been developed to optimize perovskite quality. Among them, optimizations on fabrication approaches are the dominant driving force to boost the PCE of PVSCs and have been extensively investigated from initial one step deposition, [36][37][38] through two steps, [39,40] vacuum deposition [41,42] and finally to antisolvent engineering. [43][44][45] But beyond that, additive engineering with the advantage of directly tailoring the properties of perovskite is regarded as a paramount and effective approach. Quintessentially, the additives are broken down into two categories: 1) organic additives including small molecules, fullerenes and polymers; 2) inorganic additives including metal cations, inorganic acids and nanoparticles. Almost all of them can govern the crystallization of perovskite and enhance stability. [32] However, organic additives generally passivate only Metal halide perovskite solar cells (PVSCs) have revolutionized photovoltaics since the first prototype in 2009, and up to now the highest efficiency has soared to 24.2%, which is on par with commercial thin film cells and not far from monocrystalline silicon solar cells. Optimizing device performance and improving stability have always been the research highlight of PVSCs. Metal cations are introduced into perovskites to further optimize the quality, and this strategy is...

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“…Here, a thermalized stretching exponential model is used to fit decay traces ( R ( t ) = A 1 exp (− t /τ 1 ) + A 2 exp [ − ( t /τ 2 ) β ], where τ 1 and τ 2 are time constants for fast and slow recombination components, respectively, and β is related to defect trapping) . The fast component originates from the surface recombination and is sensitive to the surface condition . The values of τ 1 are 6.30 and 3.89 ns for PVK‐10 and PVK‐45, respectively.…”

mentioning

confidence: 99%

“…On the other hand, the values of τ 2 are 50.7 and 67.6 ns for PVK‐10 and PVK‐45, respectively. Larger τ 2 of the thicker film origins from its larger grain size and better crystallinity that decreases bimolecular recombination taken place in the grains …”

mentioning

confidence: 99%

Giant Electric Bias‐Induced Tunability of Photoluminescence and Photoresistance in Hybrid Perovskite Films on Ferroelectric Substrates

Ren

Wang

Guan

et al. 2019

Advanced Optical Materials

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adom.201901092. Electric Bias-Induced ModulationHybrid perovskites (HPs), particularly methylammonium lead iodide (CH 3 NH 3 PbI 3 , hereafter MAPbI 3 ), have attracted enormous attention owing to their outstanding optoelectronic properties, such as tunable bandgap in the visible range, [1,2] long diffusion length, [3,4] superb optical absorption, [5] small exciton binding energy, [6] high ambipolar charge mobility, [7,8] and even ferroelectric polarization. [9] The solution-processed perovskite solar cells exhibit photovoltaic power conversion efficiency over 23%. [10][11][12][13] In addition to photovoltaic applications, HPs have also been exploited for light-emitting diodes, [14,15] lasing

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Zn-doping for reduced hysteresis and improved performance of methylammonium lead iodide perovskite hybrid solar cells

Cited by 77 publications

References 43 publications

Enhanced Grain Size and Crystallinity in CH3NH3PbI3 Perovskite Films by Metal Additives to the Single-Step Solution Fabrication Process

Enhanced Grain Size and Crystallinity in CH3NH3PbI3 Perovskite Films by Metal Additives to the Single-Step Solution Fabrication Process

Metal Cations in Efficient Perovskite Solar Cells: Progress and Perspective

Giant Electric Bias‐Induced Tunability of Photoluminescence and Photoresistance in Hybrid Perovskite Films on Ferroelectric Substrates

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