Magic guanidinium cations in perovskite solar cells: from bulk to interface

Wu, Pengfei; Li, Dewang; Wang, Shirong; Zhang, Fei

doi:10.1039/d2qm01315k

Cited by 9 publications

(10 citation statements)

References 109 publications

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“…Other short‐chain alkylamine functional groups, such as ethyl amino (EA + ), n‐butyl amino (BA + ), iso‐butyl amino (iso‐BA + ), and guanidine (Gua + ), [132,133] can be used to construct a low‐dimensional perovskite film on their substrates, thereby enhancing the photovoltaic conversion efficiency and lifetime of the cells [134,135] . Wang et al.…”

Section: Strategies For Defect Passivationmentioning

confidence: 99%

“…In addition, MAI can also make MA + ions enter the perovskite film by water vapor treatment and interact with water molecules to perform its hydrophobic function. [131] Other short-chain alkylamine functional groups, such as ethyl amino (EA + ), n-butyl amino (BA + ), iso-butyl amino (iso-BA + ), and guanidine (Gua + ), [132,133] can be used to construct a low-dimensional perovskite film on their substrates, thereby enhancing the photovoltaic conversion efficiency and lifetime of the cells. [134,135] Wang et al found for the first time that on the surface of 3D perovskite, BA + can form a two-dimensional layered perovskite structure with a wide forbidden bandwidth.…”

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confidence: 99%

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Defects in Perovskite Solar Cells and Their Passivation Strategies

Feng,

Liang,

Fang

et al. 2023

ChemistrySelect

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Due to their excellent photoelectric conversion efficiency and low preparation cost, perovskite solar cells (PSCs) have attracted much attention from researchers and developed rapidly in the past decade. However, the stability and efficiency of perovskite photovoltaic devices still need to be improved for their practical applications. It is mainly because the perovskite thin films are inevitably defective to some extent (such as points defects and extrinsic defects), leading to the occurrence of non‐radiative recombination (NRR) inside the device and at the interface, which is closely related to the stability and efficiency of perovskite materials. Therefore, exploring reliable passivation strategies is essential to overcome the adverse effects of NRR losses of such point defects. Here, this article summarizes the perovskite solar cells, including the crystal structure and calculations of electronic properties of perovskites, composition, and principles of operation of perovskite solar cells, and more importantly, different passivation strategies, including Lewis acid‐base passivation, anionic and cationic passivation, polymer passivation, and alkyl halogen ammonium passivation for the defects involved in perovskite materials. The passivation effects of these strategies and their regulation mechanisms of point defects involving perovskite materials are also presented. We also discuss the intrinsic relationship between crystal defects and device stability and look forward to feasible defect passivation strategy options for future research.

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Section: Strategies For Defect Passivationmentioning

confidence: 99%

mentioning

confidence: 99%

Defects in Perovskite Solar Cells and Their Passivation Strategies

Feng,

Liang,

Fang

et al. 2023

ChemistrySelect

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“…S1) by the Mixed guanidinium iodide(GAI) and methylammonium iodide(MAI) (MGM) treatment method. For the suitable ionic radius and plentiful ammonium in molecular structure, guanidinium cation(GA + ) could provide more hydrogen bonds to coordinate with the surrounding halides and stabilize the lattice [ 27 ]. ACI (n = 2) is one type of 2D perovskite with the chemical formula of (GA)(MA) 2 Pb 2 I 7 (n = 2), which is stabilized by the ordering of GA + and methylammonium cation(MA + ) alternatively in the interlayer space [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

“…This 2D perovskite has a better out-plane charge transfer property (Fig. S2) than that of the customarily used RP-phase PEA 2 PbI 4 (PEA:2-phenylethylammonium) and DJ-phase BDAPbI 4 (BDA: 1,4-butanediammonium), due to its narrower optical bandgap (1.99 eV) and reduced van der Waals gaps [ 27 , 28 ]. Besides the 2D ACI layer formation at the top surface, the GA + and MA + can penetrate bulk perovskite through grain boundaries due to the suitable ionic radius (Table S1) [ 29 , 30 ], passivating both the bulk and interfacial defects.…”

Section: Introductionmentioning

confidence: 99%

Mixed Cations Enabled Combined Bulk and Interfacial Passivation for Efficient and Stable Perovskite Solar Cells

Wang

Heo

et al. 2023

Nano-Micro Lett.

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Here, we report a mixed GAI and MAI (MGM) treatment method by forming a 2D alternating-cation-interlayer (ACI) phase (n = 2) perovskite layer on the 3D perovskite, modulating the bulk and interfacial defects in the perovskite films simultaneously, leading to the suppressed nonradiative recombination, longer lifetime, higher mobility, and reduced trap density. Consequently, the devices’ performance is enhanced to 24.5% and 18.7% for 0.12 and 64 cm2, respectively. In addition, the MGM treatment can be applied to a wide range of perovskite compositions, including MA-, FA-, MAFA-, and CsFAMA-based lead halide perovskites, making it a general method for preparing efficient perovskite solar cells. Without encapsulation, the treated devices show improved stabilities.

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“…9 Compared to typical RP phase perovskites, ACI perovskites exhibit narrower optical band gaps, 10,11 lower exciton binding energies, and longer carrier lifetimes due to the small volume of GA and MA. 12,13 Despite these advantages, it remains a challenge to control the crystallization and film formation and defect passivation of ACI perovskites. Various effective post-processing methods have been reported to improve the quality of perovskite films, such as mixed crystallization, 14 additive engineering 11,13 and solvent ligand engineering.…”

Section: Introductionmentioning

confidence: 99%