Grain Boundary Passivation with Dion–Jacobson Phase Perovskites for High‐Performance Pb–Sn Mixed Narrow‐Bandgap Perovskite Solar Cells

Zhang, Lei; Qiao, Kang; Song, Yanping; Chi, Dan; Huang, Shihua; He, Gang

doi:10.1002/solr.202000681

Cited by 23 publications

(25 citation statements)

References 55 publications

(74 reference statements)

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“…[20,28,29] Heterogeneous nucleation and rapid crystallization lead to high trap density of mixed SnPb perovskite films and inhomogeneity of the film quality when grown on substrate, greatly reducing the carrier mobility. [11] On the other hand, the introduction of Sn makes the mixed SnPb perovskites intrinsically p-doped due to the Sn vacancies mainly resulting from the readily oxidation of Sn 2+ to Sn 4+ , [10,15,20,30,31] leading to high hole carrier concentration, low carrier mobility, and increased non-radiative recombination loss, thus making the performance of low-E g PSCs unstable and underestimated.…”

Section: Introductionmentioning

confidence: 99%

Unveiling Roles of Tin Fluoride Additives in High‐Efficiency Low‐Bandgap Mixed Tin‐Lead Perovskite Solar Cells

Chen

Luo

et al. 2021

Advanced Energy Materials

113

119

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Low‐bandgap mixed tin–lead perovskite solar cells (PSCs) have been attracting increasing interest due to their appropriate bandgaps and promising application to build efficient all‐perovskite tandem cells, an effective way to break the Shockley–Queisser limit of single‐junction cells. Tin fluoride (SnF2) has been widely used as a basis along with various strategies to improve the optoelectronic properties of low‐bandgap SnPb perovskites and efficient cells. However, fully understanding the roles of SnF2 in both films and devices is still lacking and fundamentally desired. Here, the functions of SnF2 in both low‐bandgap (FASnI3)0.6(MAPbI3)0.4 perovskite films and efficient devices are unveiled. SnF2 regulates the growth mode of low‐bandgap SnPb perovskite films, leading to highly oriented topological growth and improved crystallinity. Meanwhile, SnF2 prevents the oxidation of Sn2+ to Sn4+ and reduces Sn vacancies, leading to reduced background hole density and defects, and improved carrier lifetime, thus largely decreasing nonradiative recombination. Additionally, the F− ion preferentially accumulates at hole transport layer/perovskite interface with high SnF2 content, leading to more defects. This work provides in‐depth insights into the roles of SnF2 additives in low‐bandgap SnPb films and devices, assisting in further investigations into multiple additives and approaches to obtain efficient low‐bandgap PSCs.

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Section: Introductionmentioning

confidence: 99%

Unveiling Roles of Tin Fluoride Additives in High‐Efficiency Low‐Bandgap Mixed Tin‐Lead Perovskite Solar Cells

Chen

Luo

et al. 2021

Advanced Energy Materials

113

119

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“…With the previous settings, we select a series of ratios from 0.5 to 1.0 for experimental validation under the set fabrication processing. As reported in previous works, the perovskite crystallization processes 53 , grain boundary management 54 , interface engineering 55 and charge transport layer selection 56 were proved to be critical aspects toward high-efficiency perovskite solar cells. Every precise tuning of above sections in each experimental condition is definitely difficult and time consuming.…”

Section: Resultsmentioning

confidence: 71%

Data-driven design of high-performance MASnxPb1-xI3 perovskite materials by machine learning and experimental realization

Cai

Liu

et al. 2022

Light Sci Appl

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The photovoltaic performance of perovskite solar cell is determined by multiple interrelated factors, such as perovskite compositions, electronic properties of each transport layer and fabrication parameters, which makes it rather challenging for optimization of device performances and discovery of underlying mechanisms. Here, we propose and realize a novel machine learning approach based on forward-reverse framework to establish the relationship between key parameters and photovoltaic performance in high-profile MASnxPb1-xI3 perovskite materials. The proposed method establishes the asymmetrically bowing relationship between band gap and Sn composition, which is precisely verified by our experiments. Based on the analysis of structural evolution and SHAP library, the rapid-change region and low-bandgap plateau region for small and large Sn composition are explained, respectively. By establishing the models for photovoltaic parameters of working photovoltaic devices, the deviation of short-circuit current and open-circuit voltage with band gap in defective-zone and low-bandgap-plateau regions from Shockley-Queisser theory is captured by our models, and the former is due to the deep-level traps formed by crystallographic distortion and the latter is due to the enhanced susceptibility by increased Sn4+ content. The more difficulty for hole extraction than electron is also concluded in the models and the prediction curve of power conversion efficiency is in a good agreement with Shockley-Queisser limit. With the help of search and optimization algorithms, an optimized Sn:Pb composition ratio near 0.6 is finally obtained for high-performance perovskite solar cells, then verified by our experiments. Our constructive method could also be applicable to other material optimization and efficient device development.

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“…[36,37] This is followed by the formation of Sn vacancies and introduction of additional p-type charge (Equation (1)). [38,39] Several efforts have been made to address this issue, such as Sn compensators strategy, [40,41] redox strategy, [42] core-shell [43] structure, and interface engineering; [44][45][46][47] II) overfast and uncontrolled crystalize process. The uncontrollable crystalize process [7,48,49] has been attributed to stronger reaction between Sn and organic component than that of Pb, [50] leading to inferior film quality and increasing defect density as well.…”

Section: Introductionmentioning

confidence: 99%

A Selective Targeting Anchor Strategy Affords Efficient and Stable Ideal‐Bandgap Perovskite Solar Cells

Liang

Zhang

et al. 2022

Advanced Materials

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Mixed lead–tin perovskite solar cells (LTPSCs) with an ideal bandgap are demonstrated as a promising candidate to reach higher power conversion efficiency (PCE) than their Pb‐counterparts. Herein, a Br‐free mixed lead–tin perovskite material, FA0.8MA0.2Pb0.8Sn0.2I3, with a bandgap of 1.33 eV, as a perovskite absorber, is selected. Through density functional theory calculations and optoelectronic techniques, it is demonstrated that both Pb‐ and Sn‐related A‐site vacancies are pushed into deeper energetic depth, causing severe nonradiative recombination. Hence, a selective targeting anchor strategy that employs phenethylammonium iodide and ethylenediamine diiodide as co‐modifiers to selectively anchor with Pb‐ and Sn‐related active sites and passivate bimetallic traps, respectively, is established. Furthermore, the selectivity of the molecular oriented anchor passivation is demonstrated through energetic depth specificity of Pb‐ and Sn‐related traps. As a result, a substantially enhanced open‐circuit voltage (VOC) from 0.79 to 0.90 V for the LTPSCs is achieved, yielding a champion PCE of 22.51%, which is the highest PCE among the reported ideal‐bandgap PSCs. The VOC loss is reduced to 0.43 V.

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Grain Boundary Passivation with Dion–Jacobson Phase Perovskites for High‐Performance Pb–Sn Mixed Narrow‐Bandgap Perovskite Solar Cells

Cited by 23 publications

References 55 publications

Unveiling Roles of Tin Fluoride Additives in High‐Efficiency Low‐Bandgap Mixed Tin‐Lead Perovskite Solar Cells

Unveiling Roles of Tin Fluoride Additives in High‐Efficiency Low‐Bandgap Mixed Tin‐Lead Perovskite Solar Cells

Data-driven design of high-performance MASnxPb1-xI3 perovskite materials by machine learning and experimental realization

A Selective Targeting Anchor Strategy Affords Efficient and Stable Ideal‐Bandgap Perovskite Solar Cells

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