Amidinium additives for high-performance perovskite solar cells

Chen, Qi; Ma, Yue; Liu, Na; Fan, Rundong; Kang, Jiaqian; Yang, Xiaoyan; Pei, Fengtao; Zhou, Wentao; Wang, Hao; Chen, Yihua; Wang, Lina; Hong, Jiawang; Yang, Bai; Zhou, Huanping; Zai, Huachao

doi:10.1039/d1ta08092j

Cited by 14 publications

(9 citation statements)

References 45 publications

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“…On the other hand, if the annealing procedure is conducted under the nitrogen flow, which can quickly cool down the film temperature via thermal convection, the grain size is remarkably reduced (Figure S8). These results imply that expediting the conversion of intermediates into perovskite is crucial for achieving large‐sized polycrystals [19,39] . The X‐ray diffraction (XRD) spectra of the three samples are summarized in Figure 3d, which exhibit a similar profile with two main diffraction peaks around 14.7° and 29.1°, as is characteristic of the tetragonal phase of CH 3 NH 3 PbI 3 polycrystals.…”

Section: Resultsmentioning

confidence: 85%

“…These results imply that expediting the conversion of intermediates into perovskite is crucial for achieving large-sized polycrystals. [19,39] The X-ray diffraction (XRD) spectra of the three samples are summarized in Figure 3d, which exhibit a similar profile with two main diffraction peaks around 14.7°and 29.1°, as is characteristic of the tetragonal phase of CH 3 NH 3 PbI 3 polycrystals. Nonetheless, as seen in Figure 3e, the full width at half-maximum (FWHM) of the 14.7°peak is reduced for the high-temperature annealed and the TU-treated films, in line with their large grain size.…”

Section: Chemphyschemmentioning

confidence: 82%

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Low‐Temperature Preparation of High‐Quality Perovskite Polycrystalline Films via Crystallization Kinetics Engineering

Sun

Wang

et al. 2022

ChemPhysChem

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Preparation of lead halide perovskite polycrystalline films at a low annealing temperature is highly restricted by their intrinsically large crystallization activation energy, which hinders the conversion of the precursors/intermediates to perovskites and yields as‐prepared polycrystals with tiny grain sizes and terrible crystal quality. Herein, we demonstrate through in‐situ, real‐time spectroscopic studies that both the nucleation and crystal growth kinetics can be improved without the need for a high annealing temperature by treating the film with thiourea, as accounted for by the reduced activation energy. As a consequence, the thiourea‐treated perovskite polycrystalline film exhibits larger grain sizes and greater crystallinity than the untreated one. More importantly, owing to the synergistic effect of the promoted crystallization kinetics and the passivation of surface defects, the low‐temperature prepared films treated with thiourea even present more prominent photophysical properties than those fabricated by using the conventional high‐temperature method. The strategy of crystallization kinetics engineering proposed in this work paves the way for fabricating high‐quality perovskite polycrystalline films in a low‐temperature manner.

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Section: Resultsmentioning

confidence: 85%

Section: Chemphyschemmentioning

confidence: 82%

Low‐Temperature Preparation of High‐Quality Perovskite Polycrystalline Films via Crystallization Kinetics Engineering

Sun

Wang

et al. 2022

ChemPhysChem

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“…Additive engineering has been extensively used to regulate perovskite crystallization and defects passivation. − For example, Liang et al introduced 1,8-diiodooctane (DIO) into perovskite precursor solution to regulate the kinetics of perovskite grains growth through coordinating with Pb 2+ in perovskite during crystallization . Correspondingly, a smoother and more continuous surface of perovskite grains was fabricated compared with that obtained from the pristine solution.…”

Section: Introductionmentioning

confidence: 99%

Molecular Interaction Modulates Crystallization and Defects of Perovskite Films for High-Performance Solar Cells

Fan

Tian

et al. 2022

ACS Appl. Energy Mater.

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To modulate the crystallization and defects of perovskite grains, an organic small molecule, 9-(4-methoxyphenyl)-10-tosylphenanthrene (MPTP), is synthesized and introduced into the perovskite film. Different techniques (Fourier transform infrared spectroscopy, nuclear magnetic resonance, X-ray photoelectron spectroscopy) are used to reveal the hydrogen bonding and coordination interactions between MPTP and perovskite, which are also supported by density functional theory simulation. As a result, larger grains and reduced defects of perovskite films are obtained, along with lessened nonradiative recombination and enhanced hole extraction in resultant devices. The MPTP-treated devices show significantly improved efficiency from 20.9% to 23.04%, along with enhanced storage and thermal stability.

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“…23−25 In many cases, they contain both a cation and an anion part with each playing a different role. Cations like ammonium (−NH to passivate negative defects by electrostatic interactions 26 or can be embedded into the perovskite lattice to form lowdimensional perovskites. 27,28 Anions like SCN − play an important role in overcoming growth challenges and reducing halide vacancies.…”

Section: Introductionmentioning

confidence: 99%

“…Apart from the small molecular additives possessing a single function, a variety of bifunctional or multiple functional additives have been reported recently. − In many cases, they contain both a cation and an anion part with each playing a different role. Cations like ammonium (−NH 3 + ) groups tend to passivate negative defects by electrostatic interactions or can be embedded into the perovskite lattice to form low-dimensional perovskites. , Anions like SCN – play an important role in overcoming growth challenges and reducing halide vacancies . Moreover, it is found that single molecules can also provide synergistic effects.…”

Section: Introductionmentioning

confidence: 99%

Orotic Acid as a Bifunctional Additive for Regulating Crystallization and Passivating Defects toward High-Performance Formamidinium–Cesium Perovskite Solar Cells

2022

ACS Appl. Mater. Interfaces

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Formamidinium−cesium (FA-Cs) perovskites are an attractive candidate for perovskite solar cells (PSCs) with high stability, but they tend to suffer from high intrinsic defect density, especially at grain boundaries. Herein, a common heterocyclic conjugated molecule, orotic acid (ORO), was employed as a novel bifunctional additive to simultaneously achieve crystallization regulation and defect passivation of an FA-Cs perovskite toward efficient and stable PSCs. ORO was introduced to an FA-Cs perovskite precursor solution as an effective coordination-induced crystallization regulator to improve the grain size and crystallinity. Furthermore, under the assistance of π electrons, its carboxyl group bonded with undercoordinated Pb 2+ defects at grain boundaries, and it was also able to form hydrogen bonds with undercoordinated I − defects, thus significantly reducing defect density. The average power conversion efficiency of the produced PSC devices with the ORO additive was promoted from 17.81% for the control PSCs to 19.32%, and a champion efficiency of 20.62% with negligible hysteresis was achieved. Additionally, the optimized devices exhibited high resistance to moisture incursion, leading to decent environmental stability. This work provides a convenient yet efficient approach to improve crystallization and passivate defects toward PSCs with enhanced efficiency and stability.

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Amidinium additives for high-performance perovskite solar cells

Abstract: Perovskite solar cells (PSCs) have developed rapidly and achieved power conversion efficiencies (PCE) of over 25% with diverse technical routes. However, defect is a major factor for device degradation, so...

Cited by 14 publications

References 45 publications

Low‐Temperature Preparation of High‐Quality Perovskite Polycrystalline Films via Crystallization Kinetics Engineering

Low‐Temperature Preparation of High‐Quality Perovskite Polycrystalline Films via Crystallization Kinetics Engineering

Molecular Interaction Modulates Crystallization and Defects of Perovskite Films for High-Performance Solar Cells

Orotic Acid as a Bifunctional Additive for Regulating Crystallization and Passivating Defects toward High-Performance Formamidinium–Cesium Perovskite Solar Cells

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