Origin of High Efficiency and Long-Term Stability in Ionic Liquid Perovskite Photovoltaic

Chao, Lingfeng; Niu, Tingting; Gu, Hao; Yang, Yingguo; Wei, Qi; Xia, Yingdong; Hui, Wei; Zuo, Shouwei; Zhu, Zhaohua; Pei, Chengjie; Li, Xiaodong; Zhang, Jing; Fang, Junfeng; Xing, Guichuan; Li, Hai; Huang, Xiao; Gao, Xingyu; Wu, Zhaoxin; Song, Lin; Fu, Li; Chen, Yonghua; Huang, Wei

doi:10.34133/2020/2616345

Cited by 69 publications

(70 citation statements)

References 42 publications

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“…This phenomenon explains why in Figure 3c, the reference peak becomes sharper within the first 40 s. Subsequently, Acwas gradually substituted by Xand then expelled to the grain boundaries, resulting in the formation of [SnX 6 ] 4− octahedra. [18,30] At the same time, BA + was also discharged on the film surface along with the crystal growth process. [31] This evolutionary process is reflected in Figure 3d, where the splitting left peak gradually decreases with the annealing time and the right peak gradually increases.…”

Section: Resultsmentioning

confidence: 99%

Ionic Liquid Stabilizing High‐Efficiency Tin Halide Perovskite Solar Cells

et al. 2021

Advanced Energy Materials

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Tin halide perovskites attract incremental attention to deliver lead‐free perovskite solar cells. Nevertheless, disordered crystal growth and low defect formation energy, related to Sn(II) oxidation to Sn(IV), limit the efficiency and stability of solar cells. Engineering the processing from perovskite precursor solution preparation to film crystallization is crucial to tackle these issues and enable the full photovoltaic potential of tin halide perovskites. Herein, the ionic liquid n‐butylammonium acetate (BAAc) is used to tune the tin coordination with specific O…Sn chelating bonds and NH…X hydrogen bonds. The coordination between BAAc and tin enables modulation of the crystallization of the perovskite in a thin film. The resulting BAAc‐containing perovskite films are more compact and have a preferential crystal orientation. Moreover, a lower amount of Sn(IV) and related chemical defects are found for the BAAc‐containing perovskites. Tin halide perovskite solar cells processed with BAAc show a power conversion efficiency of over 10%. This value is retained after storing the devices for over 1000 h in nitrogen. This work paves the way toward a more controlled tin‐based perovskite crystallization for stable and efficient lead‐free perovskite photovoltaics.

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Section: Resultsmentioning

confidence: 99%

Ionic Liquid Stabilizing High‐Efficiency Tin Halide Perovskite Solar Cells

et al. 2021

Advanced Energy Materials

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“…[90,91] Correspondingly, the MA film is easier to form gaseous products, likely NH 3 , HI, I 2 , and desorb from the film surface under the extreme condition. [92][93][94] The CsFAMA film showed the most stable against light illumination in UHV among these three kinds of films, attributed to that the Cs could shrink the perovskite lattice and accumulate on the film surface as a defense against light-induced degradation. [95] What is more, the chemical and structural characterizations of the chosen unstable MA perovskite film under UHV and dark condition were performed.…”

Section: High Vacuum With Light Illuminationmentioning

confidence: 99%

Perovskite Solar Cells for Space Applications: Progress and Challenges

et al. 2021

Advanced Materials

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The general chemical formula of metal halide perovskite is ABX 3 , where A is a monovalent cation (such as FA + [ formamidinium], MA + [methylammonium], or Cs + ), B is a divalent metal cation (such as Pb 2+ , Sn 2+ , or Ge 2+ ), and X is a monovalent halogen anion (such as I − , Br − , or Cl − ). [9] Photovoltaic devices based on perovskite absorbers have achieved a certified power conversion efficiency (PCE) of 25.5% [10] in single-junction devices and obtained a PCE above 26.7% [11] in tandem devices, in which the best PCE is comparable to those of some commercially available products on the photovoltaic market, such as crystalline silicon (HIT, champion PCE of 26.7%), cadmium telluride (CdTe, champion PCE of 22.1%), gallium arsenide (GaAs, champion PCE of 27.8%), and copper indium gallium selenide (CIGS, champion PCE of 23.4%) solar cells. In particular, only sub-micron-thick absorber is needed in perovskite solar cells because of perovskite's high optical absorption coefficient of about 10 4 cm −1 , [12] therefore high specific power is expected. Combined with the low-temperature solution processability and radiation resistance, [13] these features render PSCs as a Metal halide perovskites have aroused burgeoning interest in the field of photovoltaics owing to their versatile optoelectronic properties. The outstanding power conversion efficiency, high specific power (i.e., power to weight ratio), compatibility with flexible substrates, and excellent radiation resistance of perovskite solar cells (PSCs) enable them to be a promising candidate for next-generation space photovoltaic technology. Nevertheless, compared with other practical space photovoltaics, such as silicon and III-V multi-junction compound solar cells, the research on PSCs for space applications is just in the infancy stage. Therefore, there are considerable interests in further strengthening relevant research from the perspective of both mechanism and technology. Consequently, the approaches used for and the consequences of PSCs for space applications are reviewed. This review provides an overview of recent progress in PSCs for space applications in terms of performance evolution and mechanism exploration of perovskite films and devices under space extreme environments.

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“…Based on the XRD and UV–vis measurements, we conclude that MA + DFA − does not affect the crystal structure and bandgap of the perovskite films, and thus it is inferred that MA + DFA − can only be located at the grain boundaries and/or surfaces of the films rather than inside the crystal lattice itself. [ 29 ] Time‐resolved photoluminescence (TRPL) with an excitation wavelength of 500 nm and transient absorption spectra (TAS) with an excitation wavelength of 400 nm are used to study the recombination kinetics of perovskite films without and with MA + DFA − . As shown in Figure 3f, the perovskite films with MA + DFA − exhibit a longer lifetime (226.89 ns) compared with the control sample (193.93 ns), indicating the suppression of nonradioactive recombination in the perovskite film with MA + DFA − .…”

Section: Figurementioning

confidence: 99%

Efficient and Stable Perovskite Solar Cells by Fluorinated Ionic Liquid–Induced Component Interaction

et al. 2020

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Because of the high absorption coefficient, [1] extra-long carrier diffusion lengths, [2] excellent optoelectronic properties, [3] single junction organic halide perovskite solar cells (PSCs) have attracted great attention, [4] as their certified power conversion efficiencies (PCEs) have experienced unprecedentedly rapid increase from 3.8% to 25.5% over the past decade. [5] Given the outstanding photovoltaic performance, PSCs have been treated as a promising candidate for next-generation high-performance solar cells, as compared with the conventional inorganic counterparts (silicon, CdTe, and so on) including the possibility for use in spacecrafts. [6] Despite impressive progress has been made in PSCs performance in the last few years, the instability issue of organic components in polycrystalline organic halide perovskites (OHPs) films is a limiting factor for industrial exploitations. [7] In general, the organic species in OHPs, such as methylamine (MA) and formamidine (FA), usually suffer from high volatility and instability during thermalannealing processes and/or under illuminations. [8] A high density of point defects is expected for the formation of MA þ vacancies in polycrystalline OHPs films. [7a] The monovalent cation vacancies leading to shallow trap states within the bandgap can act as charge recombination centers, which limit the photovoltaic performance of PSCs. [7b] Moreover, they are considered as the main reason for the degradation in OHPs films. [9] As a countermeasure, several strategies have been developed to tackle these

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Origin of High Efficiency and Long-Term Stability in Ionic Liquid Perovskite Photovoltaic

Cited by 69 publications

References 42 publications

Ionic Liquid Stabilizing High‐Efficiency Tin Halide Perovskite Solar Cells

Ionic Liquid Stabilizing High‐Efficiency Tin Halide Perovskite Solar Cells

Perovskite Solar Cells for Space Applications: Progress and Challenges

Efficient and Stable Perovskite Solar Cells by Fluorinated Ionic Liquid–Induced Component Interaction

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