Incorporating 4-<i>tert</i>-Butylpyridine in an Antisolvent: A Facile Approach to Obtain Highly Efficient and Stable Perovskite Solar Cells

Wu, Yahan; Shi, Xiaoqiang; Ding, Xihong; Ren, Yingke; Hayat, Tasawar; Alsaedi, Ahmed; Ding, Yong; Pan, Xu; Dai, Songyuan

doi:10.1021/acsami.7b16912

Cited by 59 publications

(53 citation statements)

References 29 publications

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“…As shown in Figure 2b, the feature band at 1650 cm −1 can be assigned to the vibration of CN group in DIFA molecule. [28,29] To accurately evaluate the lifetime of the charge carriers and the density of defect state in the perovskite films, the measurements of time-resolved PL spectra (Figure 2f) are performed. In our study, tiny amount of DIFA additive is introduced in the perovskite precursor solution while no change of stretching vibration is observed.…”

Section: Resultsmentioning

confidence: 99%

Additive Engineering to Grow Micron‐Sized Grains for Stable High Efficiency Perovskite Solar Cells

et al. 2019

Advanced Science

103

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A high‐quality perovskite photoactive layer plays a crucial role in determining the device performance. An additive engineering strategy is introduced by utilizing different concentrations of N,1‐diiodoformamidine (DIFA) in the perovskite precursor solution to essentially achieve high‐quality monolayer‐like perovskite films with enhanced crystallinity, hydrophobic property, smooth surface, and grain size up to nearly 3 µm, leading to significantly reduced grain boundaries, trap densities, and thus diminished hysteresis in the resultant perovskite solar cells (PSCs). The optimized devices with 2% DIFA additive show the best device performance with a significantly enhanced power conversion efficiency (PCE) of 21.22%, as compared to the control devices with the highest PCE of 19.07%. 2% DIFA modified devices show better stability than the control ones. Overall, the introduction of DIFA additive is demonstrated to be a facile approach to obtain high‐efficiency, hysteresis‐less, and simultaneously stable PSCs.

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Section: Resultsmentioning

confidence: 99%

Additive Engineering to Grow Micron‐Sized Grains for Stable High Efficiency Perovskite Solar Cells

et al. 2019

Advanced Science

103

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“…This molecule contains a CO group, which is known to interact with Pb 2+ , making an intermediate and enlarging perovskite grain sizes up to ≈2 µm. In addition, 4‐ tert ‐butylpyridine (tBP), which is widely used for doping spiro‐OMeTAD, was also introduced as an additive by Wu et al Owing to the interaction between nitrogen atoms in tBP and Pb 2+ , nuclei were reduced and intermediate (CH 3 NH 3 I−PbI 2 −DMSO·tBP x ) was formed. Accordingly, larger perovskite grains were observed, and the best PCE with tBP additive reached 17.41%.…”

Section: Crystallization Methods In Pscsmentioning

confidence: 99%

A Review on Reducing Grain Boundaries and Morphological Improvement of Perovskite Solar Cells from Methodology and Material‐Based Perspectives

Choi

et al. 2019

Small Methods

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smtd.201900569.Perovskite solar cells (PSCs) have achieved 25.2% of their certified efficiency and emerged as up-and-coming energy-harvesting candidates owing to their superior properties. However, perovskite films are mainly polycrystalline films, and thus, the formation of grain boundaries (GBs) is inevitable. Since GBs have numerous defect sites that provide a channel for ion migration, reducing GBs is highly significant for achieving high efficiency and long-term stability of PSCs. To this end, researchers have made efforts to produce a large crystal-based perovskite film with reduced GBs. In this study, various methods that decrease GBs and enhance the morphology of perovskites are summarized and categorized into methodology-and material-based approaches. Furthermore, a future research direction to produce high-quality and large grain-based perovskite film is also proposed.

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“…The presence of TDZDT additive increased grain size, reduced defect density and eventually improved PCE from 15.61% to 19.04%. Wu et al included 4‐ tert ‐butylpyridine ( t ‐BP) with Lewis base property in chlorobenzene antisolvent, which improved the perovskite film quality and increased grain size via suppressing perovskite nucleation. As a result, PCE was improved due to improved V oc and J sc .…”

Section: Control Of Recombination In the Bulk Perovskitementioning

confidence: 99%

“…However, severe charge recombination and poor chemical stability at the ZnO/perovskite interface impede its large‐scale extensive application in PSCs . In order to conquer the above issues, interlayer between perovskite and ZnO was suggested using 1,2‐ethanedithiol (EDT) . XPS confirmed the formation of ZnS bonds after insertion of EDT.…”

Section: Interface Recombinationmentioning

confidence: 99%

Causes and Solutions of Recombination in Perovskite Solar Cells

2018

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Organic-inorganic hybrid perovskite materials are receiving increasing attention and becoming star materials on account of their unique and intriguing optical and electrical properties, such as high molar extinction coefficient, wide absorption spectrum, low excitonic binding energy, ambipolar carrier transport property, long carrier diffusion length, and high defects tolerance. Although a high power conversion efficiency (PCE) of up to 22.7% is certified for perovskite solar cells (PSCs), it is still far from the theoretical Shockley-Queisser limit efficiency (30.5%). Obviously, trap-assisted nonradiative (also called Shockley-Read-Hall, SRH) recombination in perovskite films and interface recombination should be mainly responsible for the above efficiency distance. Here, recent research advancements in suppressing bulk SRH recombination and interface recombination are systematically investigated. For reducing SRH recombination in the films, engineering perovskite composition, additives, dimensionality, grain orientation, nonstoichiometric approach, precursor solution, and post-treatment are explored. The focus herein is on the recombination at perovskite/electron-transporting material and perovskite/hole-transporting material interfaces in normal or inverted PSCs. Strategies for suppressing bulk and interface recombination are described. Additionally, the effect of trap-assisted nonradiative recombination on hysteresis and stability of PSCs is discussed. Finally, possible solutions and reasonable prospects for suppressing recombination losses are presented.

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Incorporating 4-tert-Butylpyridine in an Antisolvent: A Facile Approach to Obtain Highly Efficient and Stable Perovskite Solar Cells

Cited by 59 publications

References 29 publications

Additive Engineering to Grow Micron‐Sized Grains for Stable High Efficiency Perovskite Solar Cells

Additive Engineering to Grow Micron‐Sized Grains for Stable High Efficiency Perovskite Solar Cells

A Review on Reducing Grain Boundaries and Morphological Improvement of Perovskite Solar Cells from Methodology and Material‐Based Perspectives

Causes and Solutions of Recombination in Perovskite Solar Cells

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