Self-Elimination of Intrinsic Defects Improves the Low-Temperature Performance of Perovskite Photovoltaics

Chen, Yihua; Tan, Shunquan; Li, Nengxu; Huang, Bolong; Niu, Xiuxiu; Li, Liang; Sun, Mingzi; Zhang, Yu; Zhang, Xiao; Zhu, Cheng; Yang, Ning; Zai, Huachao; Wu, Yiliang; Ma, Sai; Yang, Bai; Chen, Qi; Xiao, Fei; Sun, Kangwen; Zhou, Huanping

doi:10.1016/j.joule.2020.07.006

Cited by 188 publications

(146 citation statements)

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“…[ 2 ] The important key to achieve state‐of‐the‐art device is the application of inorganic‐metal‐oxides (IMOs) transport layers, including TiO 2 or SnO 2 , due to their high chemical stability and excellent electrical properties. [ 3–5 ] However, one of the enormous challenges toward practical application for these types of perovskite solar cells (PSCs) is the operational stability, especially when they suffer natural light illumination including UV region. [ 6–8 ] For terrestrial PV modules, the decay rate of PCE should not exceed 5% after UV preconditioning test (60 °C, 280–385 nm wavelength, 15 mW cm −2 , duration time approaching 100 h) and maximum powerpoint (MPP) tracking light soaking test (55 °C ± 5 °C, 1000 h) according to the present International Electrotechnical Commission (IEC) 61215:2016 standards.…”

Section: Figurementioning

confidence: 99%

Stabilizing Fullerene for Burn‐in‐Free and Stable Perovskite Solar Cells under Ultraviolet Preconditioning and Light Soaking

et al. 2021

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It is crucial to make perovskite solar cells sustainable and have a stable operation under natural light soaking before they become commercially acceptable. Herein, a small amount of the small molecule bathophenanthroline (Bphen) is introduced into [6,6]‐phenyl‐C61‐butyric acid methyl ester and it is found that Bphen can stabilize the C60‐cage well through formation of much more thermodynamically stable charge‐transfer complexes. Such a strengthened complex is used as an interlayer at the in‐light perovskite/SnO2 side to achieve a champion device with efficiency of 23.09% (certified 22.85%). Most importantly, the stability of the resulting devices can be close to meeting the requirements of the International Electrotechnical Commission 61215 standard under simulated UV preconditioning and light‐soaking testing. They can retain over 95% and 92% of their initial efficiencies after 1100 h UV irradiation and 1000 h continuous illumination of maximum power point tracking at 60 °C, respectively.

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Section: Figurementioning

confidence: 99%

Stabilizing Fullerene for Burn‐in‐Free and Stable Perovskite Solar Cells under Ultraviolet Preconditioning and Light Soaking

et al. 2021

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“…Their certified power conversion efficiencies (PCEs) have advanced rapidly to more than 25%, and the stability has realized considerable improvements. [ 1–11 ] However, the PSCs suffer from the low efficiencies and poor stability under stress of light, heat, or electric bias upon scaling‐up to modules, thereby greatly restricting their commercialization. [ 12,13 ] One of the most urgent issues that limits the stability of state‐of‐the‐art PSC modules is that the p ‐dopants, such as lithium bis(trifluoromethane)sulfonimide, tris(2‐(1 H ‐pyrazol‐1‐yl)‐4‐ tert ‐butylpyridine) cobalt(III) tri[bis(trifluoromethane)sulfonimide], exhibit problems in terms of hygroscopic behavior and migration in HTL.…”

Section: Figurementioning

confidence: 99%

A Scalable Integrated Dopant‐Free Heterostructure to Stabilize Perovskite Solar Cell Modules

Sha

Zhang

et al. 2020

Advanced Energy Materials

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Perovskite solar cell (PSC) modules employing a hole transport layer (HTL) without unstable dopants possess high potential for improving operational stability. However, the low efficiencies of the devices greatly limit their commercial applications owing to the lower efficacy of the dopant‐free HTL, introduced by the unintentional n‐doping effect of volatile ions from the halide‐rich perovskite surface. Here, a scalable heterostructure integrated by a methylammonium‐free perovskite film with an iodide‐rich surface, an ultrathin interlayer of bridge‐jointed graphene oxide nanosheets (BJ‐GO), and an HTL without additional ionic dopants is developed. In this heterostructure, the iodide ions are physically immobilized by the compact 2D network, and lead defects are chemically passivated by multiple coordination bonds. Moreover, the BJ‐GO with tunable surface energy enables a highly ordered HTL a considerably improved carrier mobility by an order of magnitude. Finally, the PSC module with an area of 35.80 cm2 employing this heterostructure shows a certified efficiency of 15.3%. The encapsulated PSC modules retain over 91% of initial efficiency after the damp heat test at 85 °C and ≈85% relative humidity for 1000 h, while maintaining 90% of the initial value for 1000 h at the maximum power point under continuous 1‐Sun illumination at 60 °C.

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“…Organic/inorganic hybrid perovskite solar cells (PeSCs) have been of great interest due to their easy fabrication and high power conversion efficiency (PCE) exceeding 25%. [ 1–4 ] Nevertheless, hybrid perovskites (PVKs) suffer from low thermal stability due to the volatile nature of organic cations (i.e., methylamine), [ 5 ] which limits the commercial applications of hybrid PeSCs. [ 6,7 ] Thus, inorganic cations such as Cs + are used to replace organic cations, [ 8 ] yielding all‐inorganic PVKs with considerably improved thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Built‐In Electric Field and Defect Passivation through Gradient Doping in Inverted CsPbI₂Br Perovskite Solar Cells

et al. 2020

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Organic/inorganic hybrid perovskite solar cells (PeSCs) have been of great interest due to their easy fabrication and high power conversion efficiency (PCE) exceeding 25%. [1-4] Nevertheless, hybrid perovskites (PVKs) suffer from low thermal stability due to the volatile nature of organic cations (i.e., methylamine), [5] which limits the commercial applications of hybrid PeSCs. [6,7] Thus, inorganic cations such as Cs þ are used to replace organic cations, [8] yielding all-inorganic PVKs with considerably improved thermal stability. [9,10] Among various Cs-based inorganic PVKs, dual-halide PVKs of CsPbI 2 Br feature a suitable bandgap (E g) of around 1.9 eV and reasonable phase stability, [11] which make it a promising photoabsorber. To date, champion PCEs of 17.03% and 15.92% have been achieved for n-i-p-type (normal) and p-in (inverted)-type PeSCs, respectively, both based on CsPbI 2 Br. [12-18] Nevertheless, such PCE values are still lower than those of hybrid PeSCs. Further improvement is highly demanded for all-inorganic PeSCs. It has been well recognized that solution-processed inorganic PVK films, especially those prepared at a low temperature, are highly defective, [19] which usually result in large energy loss in PeSCs. For example, the highest reported open-circuit voltages (V OC) are 1.40 and 1.27 V for normal and inverted CsPbI 2 Br PeSCs, [15,16] respectively, both much lower than the E g (%1.9 eV) of PVK. Such large energy loss might be attributed to the severe defect-induced nonradiative recombination. [20,21] In addition, high-density interfacial defects also lead to poor contact between the PVK and electrode, which increases device series resistance and reduces short-circuit current density (J SC) and fill factor (FF). [21] To minimize the bulk and interfacial defects associated with inorganic PVKs, a variety of passivation strategies have been used, [21-28] including additive engineering and post-treatment. Nevertheless, most strategies focus on the passivation of either bulk or interfacial defects rather than both. On the other hand, considerable efforts have been devoted to maximizing the built-in electric field (BEF) of PeSCs, which facilitates carrier separation/transport and hence contributes to the V OC of the device. As the BEF is primarily determined by the work function difference between the two electrodes or transport layers (i.e., electron transport layer [ETL] and hole transport layer [HTL]), [29] BEF enhancement still remains

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Self-Elimination of Intrinsic Defects Improves the Low-Temperature Performance of Perovskite Photovoltaics

Cited by 188 publications

References 60 publications

Stabilizing Fullerene for Burn‐in‐Free and Stable Perovskite Solar Cells under Ultraviolet Preconditioning and Light Soaking

Stabilizing Fullerene for Burn‐in‐Free and Stable Perovskite Solar Cells under Ultraviolet Preconditioning and Light Soaking

A Scalable Integrated Dopant‐Free Heterostructure to Stabilize Perovskite Solar Cell Modules

Enhancing Built‐In Electric Field and Defect Passivation through Gradient Doping in Inverted CsPbI₂Br Perovskite Solar Cells

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Self-Elimination of Intrinsic Defects Improves the Low-Temperature Performance of Perovskite Photovoltaics

Cited by 188 publications

References 60 publications

Stabilizing Fullerene for Burn‐in‐Free and Stable Perovskite Solar Cells under Ultraviolet Preconditioning and Light Soaking

Stabilizing Fullerene for Burn‐in‐Free and Stable Perovskite Solar Cells under Ultraviolet Preconditioning and Light Soaking

A Scalable Integrated Dopant‐Free Heterostructure to Stabilize Perovskite Solar Cell Modules

Enhancing Built‐In Electric Field and Defect Passivation through Gradient Doping in Inverted CsPbI2Br Perovskite Solar Cells

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Enhancing Built‐In Electric Field and Defect Passivation through Gradient Doping in Inverted CsPbI₂Br Perovskite Solar Cells