Ambient air processed highly oriented perovskite solar cells with efficiency exceeding 23% via amorphous intermediate

Wang, Jiarong; Yuan, Ligang; Luo, Huiming; Duan, Chenghao; Zhou, Biao; Wen, Qiaoyun; Yan, Keyou

doi:10.1016/j.cej.2022.136968

Cited by 33 publications

(39 citation statements)

References 54 publications

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Section: Introductionmentioning

confidence: 99%

“…Therefore, the growth of PbI 2 films is crucial for the subsequent intercalation of organic ammonium salts and thus the conversion to the perovskite phases in the typical two-step sequential deposition method. 13,17,[19][20][21][22] Several works have been reported to alter the porosity of PbI 2 and the crystallization process of perovskites for the growth of high-quality perovskite films. 17,20,21,[23][24][25][26] For example, Liu and co-workers introduced 1-naphthalenemethylammonium iodide (NpMAI) or two-dimensional (2D) (NpMA) 2 PbI 4 perovskites to regulate the crystal growth in 2D/three-dimensional (3D) perovskite films.…”

Section: Introductionmentioning

confidence: 99%

“…17 Some more reports focus on the nucleation and crystallization of perovskites. 19,[26][27][28][29] For instance, Han and co-workers proposed perovskite crystal arrays (PCA) with regular distribution to aid in the nucleation and growth of perovskites. The PCA supplied perovskite nuclei that can start crystallization without conquering the critical Gibbs free energy for perovskite nucleation.…”

Section: Introductionmentioning

confidence: 99%

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Modulation of nucleation and crystallization in PbI₂ films promoting preferential perovskite orientation growth for efficient solar cells

Shao

Wang

et al. 2023

Energy Environ. Sci.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modulation of nucleation and crystallization in PbI₂ films promoting preferential perovskite orientation growth for efficient solar cells

Shao

Wang

et al. 2023

Energy Environ. Sci.

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“…We fabricated FAPbI 3 (Cl) by a two‐step deposition under ambient air condition with a relative humidity of 50–60% used in our previous reports, [ 19 ] To determine the element composition of perovskite film after the CHMAI post‐treatment, we performed X‐ray photoelectron spectroscopy (XPS) measurements. As shown in Figure a–c, the binding energies corresponding to Pb 4f, I 3d core levels of the CHMAI perovskite films all shifted marginally to lower values compared with that in the control perovskite film, suggesting the variation of surface chemical environment.…”

Section: Resultsmentioning

confidence: 99%

“…The Cl‐containing FAPbI 3 was prepared by the two‐step deposition method. [ 19 ] The CHMAI solution was spin‐coated on the upper surface of the perovskite with the optimized concentration (Figure S15 and Table S1, Supporting Information). The champion CHMAI PSC displays an enhanced PCE of 24.00% with the state steady maximum power point (MPP) maintained at ≈23.0% for 180 s ( Figure a,b and Table 1 ), which are higher than that of control perovskite‐based devices with a champion PCE of 22.49%.…”

Section: Resultsmentioning

confidence: 99%

Reexamining the Post‐Treatment Effects on Perovskite Solar Cells: Passivation and Chloride Redistribution

et al. 2023

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commercial silicon photovoltaic technology, which has achieved certified champion power conversion efficiency (PCE) of 25.7% in single-junction PSCs and 29.8% in tandem with silicon solar cells. [1,2] However, defects from the contact interfaces and the bulk in the polycrystalline perovskites films are the primary causes of carrier recombination loss and the instability of films and devices. [3][4][5] The chloride compounds are often used to enhance the performance by strengthening the film quality and eliminating defects. The better film quality is generally realized by controlling the crystallization process and grain size distribution, and stabilizing α-phase FAPbI 3 , respectively. For example, CH 3 NH 3 Cl (MACl) additive directs the growth to form intermediates for fabricating more stable perovskite and increasing the diffusion length to >1 µm. [6] A series of chloride compounds as additives or passivators were also introduced to lessen the defects. [7][8][9][10] To further understand the improvement mechanism, the spatial distribution of chloride compounds has been examined at different locations. The chloride of Cl-containing perovskite tended to be dispersed close to the perovskite/TiO 2 buried contact, according to the research from Starr and coworkers. [11] Pb-I anti-site deep-level defects at the Post-treatment is an essential passivation step for the state-of-the-art perovskite solar cells (PSCs) but the additional role is not yet exploited. In this work, perovskite film is fabricated under ambient air with wide humidity window and identify that chloride redistribution induced by post-treatment plays an important role in high performance. The chlorine/iodine ratio on the perovskite surface increases from 0.037 to 0.439 after cyclohexylmethylammonium iodide (CHMAI) treatment and the PSCs deliver a champion power conversion efficiency (PCE) of 24.42% (certificated 23.60%). The maximum external quantum efficiency of electroluminescence (EQE EL ) reaches to 10.84% with a radiance of 170 W sr −1 m −2 , forming the reciprocity relation between EQE EL and nonradiative open-circuit voltage loss (86.0 mV). After thermal annealing, 2D component of perovskite will increase while chloride decline, leading to improved photovoltage but reduced fill factor. Hence, it distinguishes that chloride enrichment can improve charge transport/ recombination simultaneously and 2D passivation can suppress the nonradiative recombination. Moreover, CHMAI can leverage their roles in charge transport/recombination for better performance than phenylethylammonium iodide (Cl/I = 0.114, PCE = 23.32%), due to the stronger binding energy of Cl − . This work provides the insight that the chloride fixation can improve the photovoltaic performance.

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Synergistic Crystallization Modulation and Defects passivation via Additive Engineering Stabilize Perovskite Films for Efficient Solar Cells

Yuan

Xiong

et al. 2023

Adv Funct Materials

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Organic‐inorganic lead halide perovskite are promising photovoltaic materials, but their intrinsic defects and crystalline quality severely deteriorate the solar cells efficiency and stability. Herein, potassium 1,1,2,2,3,3‐hexafluoroprop‐ane‐1,3‐disulfonimide (KHFDF) is introduced into PbI2 precursor solution to passivate various defects and improve the crystalline quality of perovskite films. It is found that KHFDF can inhibit PbI2 crystallization, thus tuning the crystal orientation and growth of perovskite films. Furthermore, KHFDF with dual‐functional sulfonyl group cannot only passivate grain boundaries (GBs), but also passivate the defects at GBs via strong interaction with undercoordinated Pb2+ and/or hydrogen bonding with FA+, while the K+ counter cations allow ionic interaction with undercoordinated I−. As a result, the KHFDF‐modified films exhibit high quality with a larger grain size and a reduced trap‐state density, thereby suppressing the trap‐state nonradiative recombination. And the devices show a champion efficiency up to 24.15%, benefiting from a sharp enhancement of open‐circuit voltage (Voc) of 1.183 V and fill factor of 81.78%. In addition, due to the enhanced humidity tolerance and chemical structure stability, the devices exhibit excellent long‐term humidity and thermal stability without encapsulation.

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Ambient air processed highly oriented perovskite solar cells with efficiency exceeding 23% via amorphous intermediate

Cited by 33 publications

References 54 publications

Modulation of nucleation and crystallization in PbI₂ films promoting preferential perovskite orientation growth for efficient solar cells

Modulation of nucleation and crystallization in PbI₂ films promoting preferential perovskite orientation growth for efficient solar cells

Reexamining the Post‐Treatment Effects on Perovskite Solar Cells: Passivation and Chloride Redistribution

Synergistic Crystallization Modulation and Defects passivation via Additive Engineering Stabilize Perovskite Films for Efficient Solar Cells

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Ambient air processed highly oriented perovskite solar cells with efficiency exceeding 23% via amorphous intermediate

Cited by 33 publications

References 54 publications

Modulation of nucleation and crystallization in PbI2 films promoting preferential perovskite orientation growth for efficient solar cells

Modulation of nucleation and crystallization in PbI2 films promoting preferential perovskite orientation growth for efficient solar cells

Reexamining the Post‐Treatment Effects on Perovskite Solar Cells: Passivation and Chloride Redistribution

Synergistic Crystallization Modulation and Defects passivation via Additive Engineering Stabilize Perovskite Films for Efficient Solar Cells

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Modulation of nucleation and crystallization in PbI₂ films promoting preferential perovskite orientation growth for efficient solar cells

Modulation of nucleation and crystallization in PbI₂ films promoting preferential perovskite orientation growth for efficient solar cells