Stability-limiting heterointerfaces of perovskite photovoltaics

Tan, Shaun; Huang, Tianyi; Yavuz, İlhan; Wang, Rui; Yoon, Tae Woong; Xu, Mingjie; Xing, Qiyu; Park, Keonwoo; Lee, Do Kyung; Chen, Chung-Hao; Ran, Zhi Hua; Yoon, Taegeun; Zhao, Yepin; Wang, Haocheng; Meng, Dong; Xue, Jingjing; Song, Young Jae; Pan, Xiaoqing; Park, Nam‐Gyu; Lee, Jin Wook; Yang, Yang

doi:10.1038/s41586-022-04604-5

Cited by 273 publications

(224 citation statements)

References 37 publications

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“…[22][23][24] (Figure 1a) Since the quasi-Fermi level splitting (QFLS) in the perovskite could be limited due to the E F pinning, the achievable open-circuit voltage (V OC ) and fill factor (FF) will be significantly undermined. Meanwhile, the unfavorable band bending may create a potential well to trap charges at the interface of the perovskite and CTLs and exacerbate the electron accumulation, [25] which also aggravates the recombination losses and instability of the devices. To circumvent the predicament and chemically minimize the DLTSs in polycrystalline perovskite films, strategies like surface treatment, [26][27][28][29] substrate modification, [30][31][32] and additive engineering [33][34][35][36][37][38][39] have been adopted.…”

Section: Introductionmentioning

confidence: 99%

Surface Polarity Regulation by Relieving Fermi‐Level Pinning with Naphthalocyanine Tetraimides toward Efficient Perovskite Solar Cells with Improved Photostability

Zhou

Cai

Xiong

et al. 2022

Advanced Energy Materials

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In perovskite solar cells (PSCs), defective perovskite grain boundaries (GBs) and/or surface due to photo‐excitation and the resulted suboptimal carrier dynamics at the perovskite/charge transport layer, have largely limited further performance enhancement and aggravated the PSCs instability. Fundamentally preventing the formation of these trap‐states through a simple and efficient approach is thus critical to the enhancement of both device performance and stability. Herein, a novel semiconductive silicon naphthalocyanine derivative (Cl‐SiNcTI) to reduce the deep level trap states at the GBs and the surface of perovskite film is successfully employed via a newly proposed photon‐relaxation mechanism. The resulting benign p‐type surface polarity and suppressed non‐radiation recombination lead to improved charge transport in bulk perovskite and at the perovskite/spiro‐OMeTAD interface. With a synergistic contribution of the Cl‐SiNcTI and 2‐(2‐Fluorophenyl)ethylamine iodide (oFPEAI), a 24.30% efficiency is achieved in a single cell with excellent operational stability. Moreover, under steady‐state light illumination, 93% power output compared to its initial state can still be maintained after 250 h of continuous operation.

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Section: Introductionmentioning

confidence: 99%

Surface Polarity Regulation by Relieving Fermi‐Level Pinning with Naphthalocyanine Tetraimides toward Efficient Perovskite Solar Cells with Improved Photostability

Zhou

Cai

Xiong

et al. 2022

Advanced Energy Materials

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“…Reduced WF can activate halide migration and negatively affects device stability, and CEPA treatment can alleviate this problem. [37] The CEPA-treated PSC employing OAI showed a PCE of 23.3% under reverse scanning with a stabilized PCE of 22.7% (Figure 4f). For comparison, a device treated with only OAI exhibited a PCE of 22.4% under reverse scanning, as shown in Figure S19 and Table S5, Supporting Information.…”

Section: Resultsmentioning

confidence: 96%

Molecular Engineering for Function‐Tailored Interface Modifier in High‐Performance Perovskite Solar Cells

Sung

Kim

et al. 2022

Advanced Energy Materials

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high PCE but to ensure long-term stability in various accelerated tests according to protocols set by the international summit on organic photovoltaic stability. [3] In a PSC with the n-i-p structure, a rational interface design between the perovskite and the hole transporting material (HTM) is one of the key factors governing device performance and operational stability, which are closely related to the electrical/physical contacts, the hydrophobicity of the surface, surface defects/ traps, the carrier dynamics, the interface energy-level alignment, and ion migration. To reduce the trap density of the perovskite layer, prevent recombinations at the interface, and suppress defect migration at the interface under operational conditions, numerous surface treatments of the perovskite layer using a chemically tailored organic passivator have been reported, as summarized in recent reviews. [4,5] Two major approaches have been introduced: the introduction of a Lewis base (e.g., pyridine, phosphate, carbonyl, sulfoxide, and halide) for the passivation of uncoordinated Pb 2+ and the in situ formation of a 2D perovskite using alkyl (or phenyl) ammonium salts on a 3D perovskite to eliminate defects on the perovskite surface. [6][7][8][9][10][11][12][13] However, 2D/3D heterostructured PSCs are relatively less stable at high temperatures whereas PSCs treated with a Lewis base are comparatively stable under various harsh conditions. [14][15][16] Thus far, the incorporation of molecular designed organic passivating interface modifiers (IMs) with tailored electric dipole moment into the interface of the perovskite and the HTM and the effects of this modulated interlayer on the interface energy-level alignment to facilitate hole extraction and interfacial adhesion energy to reinforce the mechanical/physical stability have rarely been explored.Self-assembled monolayers of carboxyl or phosphonic acids (PAs) in organic photovoltaics and PSCs are highly intriguing given their ability to form a dipole interlayer on top of metaloxide layers (e.g., ZnO, TiO 2 , SnO 2 ) and to induce a dramatic shift of the electronic band structure at the interface depending on the strength and direction of the net dipole moment. [17,18] PA has P=O and POH functional groups which readily bind to the surface of metal-oxide layers and usually induce a surface dipole facing the metal oxide layers. Moreover, PA as a Lewis base can bind to the surface of a perovskite layer. PA-based IMs have two parts: a head part with the PA group and a tail part with groups such as alkyl or phenyl groups, for instance. The passivation effect by PA has already been investigated, [19][20][21] but Interface modification of perovskite solar cells (PSCs) has been widely explored not only to achieve defect passivation but also to facilitate charge transport and stabilize the physical/electrical contact at device interfaces. In this study, [2-(9H-carbazol-9-yl)ethyl]phosphonic acid (CEPA) is introduced as an interface modifier at the interface of perovskite and the hole transp...

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“…Organic–inorganic hybrid perovskite materials have received great attention due to their special physicochemical properties. 1–7 Due to their high extinction coefficients, 8 wide absorption ranges, 9 high carrier mobilities 10–12 and tunable bandgaps, 13 organic–inorganic hybrid perovskites quantum dots (OIP QDs) are ideal and potential photocatalytic reduction agents. 14,15 However, the inherent poor water resistance becomes a major hindrance for OIP QD applications.…”

Section: Introductionmentioning

confidence: 99%

Water-resistant organic–inorganic hybrid perovskite quantum dots activated by the electron-deficient d-orbital of platinum atoms for nitrogen fixation

Gao

Wei

et al. 2022

Nanoscale

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Stability-limiting heterointerfaces of perovskite photovoltaics

Cited by 273 publications

References 37 publications

Surface Polarity Regulation by Relieving Fermi‐Level Pinning with Naphthalocyanine Tetraimides toward Efficient Perovskite Solar Cells with Improved Photostability

Surface Polarity Regulation by Relieving Fermi‐Level Pinning with Naphthalocyanine Tetraimides toward Efficient Perovskite Solar Cells with Improved Photostability

Molecular Engineering for Function‐Tailored Interface Modifier in High‐Performance Perovskite Solar Cells

Water-resistant organic–inorganic hybrid perovskite quantum dots activated by the electron-deficient d-orbital of platinum atoms for nitrogen fixation

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