Hydroxylated non-fullerene acceptor for highly efficient inverted perovskite solar cells

Yang, Qing; Liu, Xuan; Yu, Shuwen; Feng, Zhendong; Liu, Liang; Qin, Wei; Wang, Youyang; Chen, Shaoqiang; Feng, Zhaochi; Hou, Guangjin; Wu, Kaifeng; Guo, Xin; Li, Can

doi:10.1039/d1ee02248b

Cited by 40 publications

(42 citation statements)

References 60 publications

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“…As illustrated in Figure 1b (with the full regions shown in Figure S2, Supporting Information), the characteristic peaks at around 1460 cm –1 are attributed to the conjugated aromatic ring. [ 16,26 ] More interestingly, the characteristic stretching vibration of the C=O in Indigo slightly shifts from 1630 to ≈1614 cm –1 and the stretching vibration intensity of −NH decreases upon deposition onto the perovskite film, suggesting the chemical interaction between the Indigo molecule and the perovskite. [ 16,19 ] More direct evidence about the interaction between Indigo molecule and perovskite surface is provided by the XPS characterization (Figure 1c,d).…”

Section: Resultsmentioning

confidence: 99%

“…During the past decade, numerous passivating methods have been developed to enhance both efficiency and long‐term stability of hybrid PSCs. [ 16–18 ]…”

Section: Introductionmentioning

confidence: 99%

“…The carbonyl group (electron pair donor) in the Lewis base Indigo molecule can interact with the unfilled p‐orbitals Lewis acid Pb 2+ , Pb‐I antisites defects on the perovskite surface, and the amino group can interact with the I – sites. In addition, the hydrogen bonding between Indigo molecules and perovskite surfaces could restrain ion migration, [ 16 ] thus enhancing the stability of perovskite crystal structure. Resultantly, the PCE of the Indigo passivated PSCs is enhanced from 20.18% to 23.22% with simultaneously increased short‐circuit current density (J sc ), open‐circuit voltage ( V oc ), and fill factor (FF) as well as reduced hysteresis relative to the control one.…”

Section: Introductionmentioning

confidence: 99%

“…During the past decade, numerous passivating methods have been developed to enhance both efficiency and long-term stability of hybrid PSCs. [16][17][18] In these polycrystalline perovskite films, defects formed at either surface or grain boundaries have been widely reported to significantly restrict carriers transport and crystal stability, which further deteriorates the device performance. [19,20] Indeed, a large number of defects are generated during the film crystallization process due to the low formation energy and soft lattice character of the perovskite crystals.…”

mentioning

confidence: 99%

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Indigo: A Natural Molecular Passivator for Efficient Perovskite Solar Cells

Guo

Sun

et al. 2022

Advanced Energy Materials

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Benefiting from these unique properties, the power conversion efficiency (PCE) of perovskite solar cells (PSCs) has rapidly increased from initial ≈3% to now 25.5%, [7][8][9] situating it at the forefront of the third-generation solar cells. [10,11] Unfortunately, these ionic hybrid perovskite materials are extremely sensitive to light, [12,13] heat, [14] and moisture, [15] resulting in unstable crystal structures. During the past decade, numerous passivating methods have been developed to enhance both efficiency and long-term stability of hybrid PSCs. [16][17][18] In these polycrystalline perovskite films, defects formed at either surface or grain boundaries have been widely reported to significantly restrict carriers transport and crystal stability, which further deteriorates the device performance. [19,20] Indeed, a large number of defects are generated during the film crystallization process due to the low formation energy and soft lattice character of the perovskite crystals. [21,22] Besides, the ionic nature of hybrid halide perovskite leads to unfavorable carrier recombination and ion migration in the perovskite films, resulting in unsatisfactory efficiency or stability of the devices. [23,24] In particular, the crystallization process is accompanied by the ubiquitous formation of imperfections at grain boundaries and surfaces, metallic lead clusters, and intrinsic point defects. [24][25][26] Among them, intrinsic site Organic-inorganic hybrid lead halide perovskite solar cells have made unprecedented progress in improving photovoltaic efficiency during the past decade, while still facing critical stability challenges. Herein, the natural organic dye Indigo is explored for the first time to be an efficient molecular passivator that assists in the preparation of high-quality hybrid perovskite film with reduced defects and enhanced stability. The Indigo molecule with both carbonyl and amino groups can provide bifunctional chemical passivation for defects. In-depth theoretical and experimental studies show that the Indigo molecules firmly binds to the perovskite surfaces, enhancing the crystallization of perovskite films with improved morphology. Consequently, the Indigo-passivated perovskite film exhibits increased grain size with better uniformity, reduced grain boundaries, lowered defect density, and retarded ion migration, boosting the device efficiency up to 23.22%, and ≈21% for large-area device (1 cm 2 ). Furthermore, the Indigo passivation can enhance device stability in terms of both humidity and thermal stress. These results provide not only new insights into the multipassivation role of natural organic dyes but also a simple and low-cost strategy to prepare high-quality hybrid perovskite films for optoelectronic applications based on Indigo derivatives.

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Section: Resultsmentioning

confidence: 99%

“…During the past decade, numerous passivating methods have been developed to enhance both efficiency and long‐term stability of hybrid PSCs. [ 16–18 ]…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Indigo: A Natural Molecular Passivator for Efficient Perovskite Solar Cells

Guo

Sun

et al. 2022

Advanced Energy Materials

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“…In other words, there is a trade-off between the surface defect passivation and the formation of ordered molecular structure when the C 60 derivatives are used as the ETL. On the other hand, the non-fullerene electron acceptor was used as an interlayer in between the ETL and perovskite crystalline thin film, which resulted in a high PCE of 22.09% mainly due to the reduced surface defects and improved carrier transport [ 156 ].…”

Section: Roles Of Etl In Inverted Perovskite Solar Cellsmentioning

confidence: 99%

Understanding the PEDOT:PSS, PTAA and P3CT-X Hole-Transport-Layer-Based Inverted Perovskite Solar Cells

Lin

et al. 2022

Polymers

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The power conversion efficiencies (PCEs) of metal-oxide-based regular perovskite solar cells have been higher than 25% for more than 2 years. Up to now, the PCEs of polymer-based inverted perovskite solar cells are widely lower than 23%. PEDOT:PSS thin films, modified PTAA thin films and P3CT thin films are widely used as the hole transport layer or hole modification layer of the highlyefficient inverted perovskite solar cells. Compared with regular perovskite solar cells, polymer-based inverted perovskite solar cells can be fabricated under relatively low temperatures. However, the intrinsic characteristics of carrier transportation in the two types of solar cells are different, which limits the photovoltaic performance of inverted perovskite solar cells. Thanks to the low activation energies for the formation of high-quality perovskite crystalline thin films, it is possible to manipulate the optoelectronic properties by controlling the crystal orientation with the different polymer-modified ITO/glass substrates. To achieve the higher PCE, the effects of polymer-modified ITO/glass substrates on the optoelectronic properties and the formation of perovskite crystalline thin films have to be completely understood simultaneously.

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Incubating High‐Quality Perovskite Film via Facial Mask Technique for Efficient and Stable Solar Cells

Tang

Zhao

Zong

et al. 2022

Adv Funct Materials

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High-performance perovskite film with superior internal and surface qualities is critical for perovskite solar cells (PSCs) but hardly achievable due to the rapid crystallization rate of perovskite itself. Herein, a novel technique by in situ manipulating perovskite crystal growth and modifying the surface properties is developed using organic passivating agent-assisted polydimethylsiloxane membrane as a facial mask (FM) of perovskites. By placing the perovskite-precursor films with their faces toward the designed FM during thermal annealing, a favorable microenvironment is constructed for incubating high-quality perovskite films with smooth surface, enhanced vertical orientation of (100) plane, and well-adjusted interfacial energy levels. With this versatile FM incubation technique, efficient PSCs for both methylammonium (MA)-based and formamidinium (FA)-MA-Cs mixed perovskite systems are facilely fabricated, delivering excellent humidity/thermal stabilities and promising efficiencies up to 21.4% with an improved open-circuit voltage of 1.15 V in MA-based devices. This study not only provides a facile and efficient approach to rationally manage the perovskite growth process, but also reveals the fundamental characteristics of high-quality perovskite films comprehensively for the construction of efficient and stable PSCs.

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Hydroxylated non-fullerene acceptor for highly efficient inverted perovskite solar cells

Abstract: Inverted perovskite solar cells (i-PSCs) manifest negligible hysteresis and potential to construct tandem solar cells attracting much attention, but their power conversion efficiency (PCE) still lags behind conventional ones due...

Cited by 40 publications

References 60 publications

Indigo: A Natural Molecular Passivator for Efficient Perovskite Solar Cells

Indigo: A Natural Molecular Passivator for Efficient Perovskite Solar Cells

Understanding the PEDOT:PSS, PTAA and P3CT-X Hole-Transport-Layer-Based Inverted Perovskite Solar Cells

Incubating High‐Quality Perovskite Film via Facial Mask Technique for Efficient and Stable Solar Cells

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