Tautomeric Molecule Acts as a “Sunscreen” for Metal Halide Perovskite Solar Cells

Wang, Yang; Zhang, Zemin; Lan, Yangjie; Song, Qian; Li, Mingzhu; Song, Yanlin

doi:10.1002/anie.202100218

Cited by 89 publications

(75 citation statements)

References 37 publications

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“…Pb 2+ is prone to be reduced to metallic Pb 0 upon illumination, which is a deep defects state and severally degrades the performance of PSCs, as well as their long-term stability. [29] Notably, Pb 0 defects are effectively inhibited by F-BP (BP) film (Figure 3a), arising from Lewis acid-base interaction between uncoordinated Pb 2+ and P (F − ), which has been verified by previous report. [30] XPS valence spectra are given in Figure S18, Supporting Information.…”

Section: Resultssupporting

confidence: 80%

Fluorinated Black Phosphorene Nanosheets with Robust Ambient Stability for Efficient and Stable Perovskite Solar Cells

Liu

Chen

et al. 2021

Adv Funct Materials

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Extraordinary electronic and photonic features (e.g., tunable direct bandgap, high ambipolar carrier mobility) render few-layer black phosphorus (BP) nanosheets/quantum dots an important optoelectronic material. However, most of the BP applied in metal halide perovskite solar cells (PSCs) are produced by sonication-assisted liquid exfoliation, which inevitably brings inferior electronic properties, thus leading to limited beneficial effects. Furthermore, this study uncovers that the intrinsic instability of BP nanosheets sandwiched between (CsFAMA)Pb(BrI) 3 perovskite and spiro-OMeTAD has a deleterious effect on the performance stabilization of PSCs. To address the above constraints, a feasible strategy herein is developed by introducing high-quality fluorinated BP (F-BP) nanosheets synthesized by one-step electrochemical delamination. In addition to P-Pb coordination, there is a strong hydrogen bond between F − and MA + /FA + as well as an ionic bond between F − and Pb 2+ for the perovskite/F-BP interface, thus leading to fewer interfacial traps than perovskite/BP, which is responsible for the highest power conversion efficiency (22.06%) of F-BP devices. More importantly, F-BP devices exhibit significantly improved humidity and shelflife stabilities due to the excellent ambient stability of F-BP, resulting from the antioxidation and antihydration behavior of fluorine adatoms. Overall, the findings provide a promising strategy to simultaneously enhance the photovoltaic performance and long-term stability of BP-based PSCs.

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Section: Resultssupporting

confidence: 80%

Fluorinated Black Phosphorene Nanosheets with Robust Ambient Stability for Efficient and Stable Perovskite Solar Cells

Liu

Chen

et al. 2021

Adv Funct Materials

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“…UV light can be classified into four groups: UVA (400–320 nm), UVB (320–280 nm), UVC (280–100 nm), and EUV (100–10 nm). [ 41 ] UVC light is generally blocked by the ozone layer, while UVB and UVA are of greater concern for human health. Compared with UVB, UVA radiation demonstrates stronger carcinogenicity and a 1000‐fold increase in skin sunburn.…”

Section: Resultsmentioning

confidence: 99%

Ultrahigh‐Performance Optoelectronic Skin Based on Intrinsically Stretchable Perovskite‐Polymer Heterojunction Transistors

Bian

Kuang

et al. 2021

Advanced Materials

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The optoelectronic skin is acknowledged as the world's current cutting‐edge technology in the fields of wearable healthcare monitoring, soft robotics, artificial retinas, and so on. However, the difficulty in preparing stretchable photosensitive polymers and the high‐crystallization nature of most reported photosensitive materials (such as perovskites) severely restrict the development of skin‐like optoelectronic devices. Herein, a surface energy‐induced self‐assembly methodology is proposed to form easily transferrable and flexible perovskite quantum dot (PQD) films with a worm‐like morphology. Furthermore, intrinsically stretchable phototransistors (ISTPTs) are fabricated based on a stretchable photosensitive layer heterojunction consisting of worm‐like PQD films and hybrid polymer semiconductors. The obtained ISTPTs display highly sensitive response to high‐energy photons of X‐ray (with a detection limit of 79 nGy s−1, that is 560 times lower than commercial medical chest X‐ray diagnosis) and ultraviolet (with photosensitivity of 5 × 106 and detectable light intensity of 50 nW cm−2 among the highest performance of reported photodetectors). In addition, these ISTPTs demonstrate desirable e‐skin characteristics with high strain tolerance, high sensing specificity, high optical transparency, and good skin conformability. The surface energy‐induced self‐assembly methodology for the preparation of ISTPTs is a critical demonstration to enable low‐cost and high‐performance optoelectronic skins.

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“…Especially under UV exposure, the photovoltaic (PV) performance of PSCs could drop dramatically with the halogen oxidation and Pb reduction because of the vulnerability of perovskite to UV light. [20,21] This process is further accelerated by the desorption of UV-activated oxygen from ETLs, which also exposes deep-level interfacial defects and thus affecting the charge collection. [22][23][24] Although various strategies have been adopted to modify the ETLs to reduce defects, [25][26][27][28][29] there is little research effort on the interaction between the modified ETLs and perovskite films.…”

mentioning

confidence: 99%

CsI Enhanced Buried Interface for Efficient and UV‐Robust Perovskite Solar Cells

Miao

Ning

et al. 2021

Advanced Energy Materials

119

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PCE has reached 25.5% in less than one decade since the first report of all-solid-state PSCs in 2012. [5][6][7] Although remarkable progress has been made in device efficiency, there is still a huge gap toward the theoretical Shockley-Queisser limit efficiency (30.5%). [8] Besides the PCE, the long-term stability of PSCs is of great significance for commercial applications, but it could be affected by the interfacial degradation induced by various stresses. [3,4] In a typical planar n-i-p PSC structure, the perovskite absorber is sandwiched between an electron transport layer (ETL) and hole transport layer (HTL). The interfaces between perovskite and carrier transport layers have been considered crucial for the further improvement of efficiency and stability of PSCs. [9,10] On the one hand, the interfacial defects and imperfect band alignments would result in substantial nonradiative recombination losses and thus compromised PCE. [11,12] On the other hand, the degradation of PSCs derived from both perovskite/HTL interfaces and ETL/perovskite interfaces severely threatens the stability of PSCs. [13][14][15][16] Plenty of research has concentrated on stabilizing perovskite/ HTL interfaces via post-fabrication treatment and HTL modification. [17] However, the concentration of defects accumulating at the buried interface is even higher than that at the top interface, [18] which makes the buried interface equally significant as the top interface. Unfortunately, little attention has been paid to it, which is partly because of the difficulties in fabricating and investigating the buried interface. [19] Moreover, the perovskite film near the ETL interface bears the strongest illumination stress under operational condition. Especially under UV exposure, the photovoltaic (PV) performance of PSCs could drop dramatically with the halogen oxidation and Pb reduction because of the vulnerability of perovskite to UV light. [20,21] This process is further accelerated by the desorption of UV-activated oxygen from ETLs, which also exposes deep-level interfacial defects and thus affecting the charge collection. [22][23][24] Although various strategies have been adopted to modify the ETLs to reduce defects, [25][26][27][28][29] there is little research effort on the interaction between the modified ETLs and perovskite films. Recently, Dong and co-workers reported a perovskite/ ETL interface enhancement strategy where formamidinium iodide incorporated SnO 2 reacts with PbI 2 -excess perovskiteThe buried interface between the perovskite and the electron transport layer (ETL) plays a vital role for the further improvement of power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). However, it is challenging to efficiently optimize this interface as it is buried in the bottom of the perovskite film. Herein, a buried interface strengthening strategy for constructing efficient and stable PSCs by using CsI-SnO 2 complex as an ETL is reported. The CsI modification facilitates the growth of the perovskite film and eff...

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Tautomeric Molecule Acts as a “Sunscreen” for Metal Halide Perovskite Solar Cells

Cited by 89 publications

References 37 publications

Fluorinated Black Phosphorene Nanosheets with Robust Ambient Stability for Efficient and Stable Perovskite Solar Cells

Fluorinated Black Phosphorene Nanosheets with Robust Ambient Stability for Efficient and Stable Perovskite Solar Cells

Ultrahigh‐Performance Optoelectronic Skin Based on Intrinsically Stretchable Perovskite‐Polymer Heterojunction Transistors

CsI Enhanced Buried Interface for Efficient and UV‐Robust Perovskite Solar Cells

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