Direct Surface Passivation of Perovskite Film by 4-Fluorophenethylammonium Iodide toward Stable and Efficient Perovskite Solar Cells

Jiang, Xiongzhuo; Chen, Shi; Li, Yang; Zhang, Lihua; Shi, Nan; Zhang, Guoge; Du, Jun; Fu, Nianqing; Xu, Baomin

doi:10.1021/acsami.0c17773

Cited by 98 publications

(90 citation statements)

References 41 publications

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“…The ternary‐based devices have a J SC of 26.04 ± 0.23 mA cm −2 , a V OC of 1.08 ± 0.01 V, a FF of 0.82 ± 0.01; the corresponding PCE is 23.06 ± 0.70%, which is among the highest for PSCs with the p–i–n device structure. [ 4,51,52 ] Moreover, the photocurrent hysteresis index (HI) [ 54 ] is 0.035 in the ternary‐based PSCs, down from a HI value of 0.104 in the mixed 2D:3D‐based PSCs. We suggest that this remarkable decrease in photocurrent hysteresis can be attributed to a reduced number of defects (see calculated trap densities in Section S1 of the Supporting Information) and the appearance of chemical interactions between the perovskite and O6T‐4F (specifically, Pb 2+ and C=O).…”

Section: Device Performancementioning

confidence: 99%

High‐Performance Ternary Perovskite–Organic Solar Cells

et al. 2022

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Perovskite solar cells in which 2D perovskites are incorporated within a 3D perovskite network exhibit improved stability with respect to purely 3D systems, but lower record power conversion efficiencies (PCEs). Here, a breakthrough is reported in achieving enhanced PCEs, increased stability, and suppressed photocurrent hysteresis by incorporating n‐type, low‐optical‐gap conjugated organic molecules into 2D:3D mixed perovskite composites. The resulting ternary perovskite–organic composites display extended absorption in the near‐infrared region, improved film morphology, enlarged crystallinity, balanced charge transport, efficient photoinduced charge transfer, and suppressed counter‐ion movement. As a result, the ternary perovskite–organic solar cells exhibit PCEs over 23%, which are among the best PCEs for perovskite solar cells with p–i–n device structure. Moreover, the ternary perovskite–organic solar cells possess dramatically enhanced stability and diminished photocurrent hysteresis. All these results demonstrate that the strategy of exploiting ternary perovskite–organic composite thin films provides a facile way to realize high‐performance perovskite solar cells.

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Section: Device Performancementioning

confidence: 99%

High‐Performance Ternary Perovskite–Organic Solar Cells

et al. 2022

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“…The rationale is that passivating the harmful defects on the interface and crystal boundaries of perovskite layers may significantly hinder the production of recombination centers and suppress hysteresis. 13,14 There are two passivation methods that reduce perovskite film defects: (a) surface defect passivation and (b) promoting perovskite crystallization, increasing the grain size, and improving the film quality to reduce bulk defects. The reduction of defects in perovskite films improves the PCE and stability of the devices.…”

Section: Introductionmentioning

confidence: 99%

Improvement Performance of Planar Perovskite Solar Cells by Bulk and Surface Defect Passivation

Cai

Lin

Zhang

et al. 2021

ACS Sustainable Chem. Eng.

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The photovoltaic property of perovskite solar cells (PSCs) is affected by detrimental defects located at the bulk and surface of perovskite films. Furthermore, defect passivation of the perovskite films is challenging. Herein, we add solid CsCl to PbI 2 precursor solutions to adjust the properties of PbI 2 membranes and obtain perovskite layers with a micrometer-sized grain by reducing grain boundary defects. Bulk defects are reduced by the increase in grain size and decrease in grain boundaries. Fewer bulk defects and the incorporation of Cs increase the device performance, improving the power conversion efficiency (PCE) from 19.72% to 22.24% and suppressing hysteresis. The passivation of surface defects further increases the PCEs and open-circuit voltages (V OC ) of PSCs. Therefore, we use 4-methoxyphenethylamine (CH 3 O−PEAI) to modify the CsCl perovskite films to eliminate the surface defects and suppress nonradiative charge recombination. The surface defect passivation using CH 3 O−PEAI further improves the PCE of the PSCs to 23.25% with a V OC of 1.186 V, resulting in more efficient and stable PSCs.

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“…First, the original surface grain size will be recrystallized with the participation of 2D perovskite under solution processing conditions, which leads to a change in the grain size. [11,[138][139][140][141][142][143] Zhang and co-workers introduced BAI into the surface of 3D perovskite film by post-treatment process and found that the grain size increases, as shown in Figure 8a. [137] The grain size on the surface increased as the BAI concentration increased.…”

Section: Morphology Modificationmentioning

confidence: 99%

Surface Passivation Using 2D Perovskites toward Efficient and Stable Perovskite Solar Cells

Wu¹,

Liang²,

et al. 2022

Advanced Materials

322

208

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first solid-state perovskite solar cell (PSC) was successfully prepared by introducing Sprio as a hole transport layer (HTL), tremendous efforts have been devoted to further promoting the photovoltaic performance, including surface passivation, bulk doping, processing engineering, and optimizing the structure of the device. [9][10][11][12][13][14][15][16][17][18][19][20][21] Consequently, the power conversion efficiency (PCE) of PSCs has dramatically increased from the initial 9% to an impressive 25.2% in several years. [22,23] To date, the coexistence of high efficiency and long-term stability has become a crucial requirement for successful PSC applications. 2D perovskites (consisting of pure 2D and quasi-2D perovskites) have emerged as a new family of photovoltaic materials that have been proven to resolve the problem of instability in perovskites. Owing to the insulating spacer layer, inherent outstanding long-term stability is obtained in 2D perovskites, including hydrophobicity, suppression of ion migration, and larger formation energy. [24][25][26][27][28] However, severe carrier recombination occurs due to the combined effect of quantum confinement and dielectric confinement, rooted in the natural multiple quantum wells structure (MQWs) (Figure 1), where the inorganic parts act as potential "wells" while the organic parts act as "walls", which shows a boost in the photovoltaic performance of 2D PSCs. [29][30][31] To realize the coexistence of high efficiency and ultrastability in PSCs, researchers began to construct 2D/3D heterostructures by surface passivation. [32][33][34][35][36][37][38][39][40] In fact, before the boosting of the 2D/3D stacking concept, many researchers have applied large ammonium cations (such as phenethylamine (PEA), butylamine (BA), and quaternary ammonium (QA)) as defect passivants to 3D perovskite solar cells. [41][42][43][44][45] During this period, the pure PEA-or BA-based 2D perovskites have been explored as light-absorbing materials for better stability. [25,46] In 2015, Yao et al. introduced in situ grown 2D perovskite (PEI) 2 PbI 4 (PEI: polymeric ammonium) on an MAPbI 3 film, leading to more stable and efficient PSCs. [47] In 2016, discussions and analyses of the surface passivation effect began to emerge, which involved exploring a series of 2D perovskite molecules (such as aniline, benzylamine, and PEA). [42,45,48] The concept of 2D/3D stacking really stood out in 2018 by unveiling the chemical reaction mechanism for heterojunction formation and the mechanism for enhancing stability. For example, Huang 3D perovskite solar cells (PSCs) have shown great promise for use in next-generation photovoltaic devices. However, some challenges need to be addressed before their commercial production, such as enormous defects formed on the surface, which result in severe SRH recombination, and inadequate material interplay between the composition, leading to thermal-, moisture-, and light-induced degradation. 2D perovskites, in which the organic layer functions as a protective barrier ...

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Direct Surface Passivation of Perovskite Film by 4-Fluorophenethylammonium Iodide toward Stable and Efficient Perovskite Solar Cells

Cited by 98 publications

References 41 publications

High‐Performance Ternary Perovskite–Organic Solar Cells

High‐Performance Ternary Perovskite–Organic Solar Cells

Improvement Performance of Planar Perovskite Solar Cells by Bulk and Surface Defect Passivation

Surface Passivation Using 2D Perovskites toward Efficient and Stable Perovskite Solar Cells

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