Steering the electron transport properties of pyridine-functionalized fullerene derivatives in inverted perovskite solar cells: the nitrogen site matters

Li, Bairu; Zhen, Jieming; Wan, Yangyang; Lei, Xunyong; Jia, Lingbo; Wu, Xiaojun; Zeng, Hualing; Chen, Muqing; Wang, Guan‐Wu; Yang, Shangfeng

doi:10.1039/c9ta12188a

Cited by 30 publications

(35 citation statements)

References 56 publications

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“…The V TFL of samples without and with FMAC are 0.27 and 0.06 V, respectively. [38] Accordingly, the calculated n t are 5.38 Â 10 15 and 1.19 Â 10 15 cm À3 , respectively, in line with the order of magnitude of previous results. [39] This result directly verifies that FMAC can significantly lower the trap-state density in perovskite films.…”

Section: Resultssupporting

confidence: 89%

Improving Performance and Stability of Planar Perovskite Solar Cells Through Passivation Effect with Green Additives

et al. 2021

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Perovskite solar cells (PSCs) have debuted as the photovoltaic devices with the most potential and progress is being made at an unprecedented pace. Meanwhile, additive engineering is continuously pushing the power conversion efficiency (PCE) and device stability to higher levels by passivating defects and regulating crystallization behaviors. Considering the scalable fabrication of PSCs in the following stage, seeking green additives for optimizing perovskites is extremely valuable and paramount. Herein, we pioneer a green additive engineering method using fumaric acid (FMAC) to optimize the three‐cation perovskites to obtain highly efficient PSCs. FMAC not only optimizes crystallization behaviors to endow the perovskite films with a large grain size and few grain boundaries, but also forms a strong interaction with Pb2+/I− of the perovskites, thereby stabilizing the [PbI6]4− octahedral framework of the perovskite crystal lattices and effectively passivating the surface defects. On this basis, FMAC improves the photoelectric properties of perovskites and in particular, suppresses the nonradiative recombination. Consequently, the PCE of PSCs incorporating FMAC rises to 20.48%, exceeding that (19.18%) of the pristine device. In addition, FMAC also enhances the stability of PSCs. Therefore, we provide a significant strategy using a green additive to enhance the photovoltaic performance of PSCs.

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Section: Resultssupporting

confidence: 89%

Improving Performance and Stability of Planar Perovskite Solar Cells Through Passivation Effect with Green Additives

et al. 2021

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“…[30][31][32] In addition, the PL peak of the ITO/C 60 -3-BPy/perovskite film shows a blue-shift from 766 nm to approximately 757 nm relative to that of the ITO/PCBM/perovskite film, suggesting decreased trap states within perovskite with C 60 -3-BPy ETL resulted from the improved perovskite crystallinity, the reduced grain boundaries, and Lewis acid-base reaction between the pyridine group and Pb 2+ of the perovskite. [20,27,28,[33][34][35] The TRPL measurements were further used to study the charge transfer kinetics from the perovskite to the fullerene derivatives (Figure 4B and Table S2). The life of 21.12 ns for C 60 -3-BPy/perovskite film is shorter than that of the PCBM/perovskite film (23.59 ns), suggesting the effective charge transfer from perovskite to C 60 -3-BPy ETL.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, we reported a novel pyridine-functionalized fullerene derivative (C 60 -3-BPy) by a facile one-step method, which was applied as the ETL of inverted (p-i-n) MAPbI 3 -based PSCs, exhibiting a higher efficiency and stability than that of the control devices with conventional PCBM as ETL. [25][26][27][28] Whether such a pyridine-functionalized fullerene derivative can be applied as an independent ETL in n-i-p PSCs affording improved PCE remains an open question.…”

Section: Introductionmentioning

confidence: 99%

Pyridine‐functionalized fullerene derivative as an independent electron transport layer enabling efficient and hysteresis‐free regular perovskite solar cells

Wang

Jia

et al. 2021

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Suitable electron transport materials bearing good interfacial contact, improved electron transport ability, and matched energy levels are indispensable for developing efficient perovskite solar cells (PSCs). Herein, regular (n-i-p) planar Cs 0.05 FA 0.83 MA 0.12 PbI 2.55 Br 0.45 (CsFAMA) PSC devices were fabricated using a pyridine-functionalized fullerene derivative (C 60 -3-BPy) as an independent electron transport layer (ETL), delivering a decent power conversion efficiency (PCE) of 18.22%, which is dramatically higher than that of the control device based on [6,6]-phenyl-C 61 -butyric acid methyl ester (PCBM) ETL (15.70%). The energy level offset between C 60 -3-BPy and the perovskite is smaller than that based on PCBM ETL, which is beneficial for efficient ohmic contact in ETL/perovskite interface and improved open-circuit voltage (V oc ). Moreover, C 60 -3-BPy affords strong coordination interactions with perovskite, leading to an improved film quality of the perovskite layer with enlarged grain size and decreased trap state density, which contribute to facilitated electron extraction as reflected by the increases of both the fill factor (FF) and the short-circuit current (J sc ). C 60 -3-BPyfacilitated electron extraction further results in hysteresis-free devices.

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“…Therefore, as the major ETLs in TPSCs, fullerene derivatives deserve more attention and research. Although many studies are devoted to exploring novel fullerene derivatives, such as ETLs [ 14 , 15 , 16 , 17 , 18 , 19 , 20 ], dopants [ 21 , 22 , 23 , 24 , 25 ], or modified layers [ 26 , 27 , 28 ] to enhance the performance of lead-based perovskite solar cells (LPSCs), few studies have explored the application of new fullerene materials in TPSCs.…”

Section: Introductionmentioning

confidence: 99%

Fullerene Derivative with Flexible Alkyl Chain for Efficient Tin-Based Perovskite Solar Cells

et al. 2022

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Fullerene derivatives are considered excellent materials for the extraction and transportation of electrons in the production of efficient tin-based perovskite solar cells (TPSCs). However, it is not clear how the molecular structure of fullerene derivatives affects the efficiency and stability of TPSCs. In this study, the effects of fullerene derivatives, (6,6)-phenyl-C61-butyric acid hexyl ester (PCBH) and (6,6)-phenyl-C61-butyric acid methyl ester (PCBM), with different functional groups, on photovoltaic performance were investigated. The flexible alkyl chain of PCBH effectively improved the film morphology and stability, the electron extraction and transport capabilities, and the interface contact of fullerene and perovskite. As a result, the PCBH-based TPSC yielded a higher efficiency, of 9.21%, than the PCBM-based devices (7.54%). More importantly, the PCBH-based films exhibited higher stability and effectively suppressed the oxidation of Sn2+ by inhibiting oxygen permeation. Therefore, the PCBH-based devices exhibited significantly enhanced stability. This result indicates that optimizing the functional group of fullerene derivatives is crucial for improving the efficiency and stability of TPSCs.

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Steering the electron transport properties of pyridine-functionalized fullerene derivatives in inverted perovskite solar cells: the nitrogen site matters

Abstract: Three pyridine-functionalized fullerene derivatives with variable nitrogen sites were synthesized and used as electron transport layers of iPSCs, exhibiting tunable interactions with the perovskite layer and different electron transport properties.

Cited by 30 publications

References 56 publications

Improving Performance and Stability of Planar Perovskite Solar Cells Through Passivation Effect with Green Additives

Improving Performance and Stability of Planar Perovskite Solar Cells Through Passivation Effect with Green Additives

Pyridine‐functionalized fullerene derivative as an independent electron transport layer enabling efficient and hysteresis‐free regular perovskite solar cells

Fullerene Derivative with Flexible Alkyl Chain for Efficient Tin-Based Perovskite Solar Cells

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