Cation and anion immobilization through chemical bonding enhancement with fluorides for stable halide perovskite solar cells

Li, Nengxu; Tao, Shuxia; Chen, Yihua; Niu, Xiuxiu; Onwudinanti, Chidozie; Hu, Chen; Qiu, Zhiwen; Xu, Ziqi; Zheng, Guanhaojie; Wang, Ligang; Zhang, Yu; Li, Liang; Liu, Huifen; Lun, Yingzhuo; Hong, Jiawang; Wang, Xueyun; Liu, Yuquan; Xie, Haipeng; Gao, Yongli; Yang, Bai; Yang, Shihe; Brocks, G.; Chen, Qi; Zhou, Huanping

doi:10.1038/s41560-019-0382-6

Cited by 980 publications

(690 citation statements)

References 46 publications

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“…These defects have relatively small formation energy in MHPs . It should be noted that both halide and lead defects coexist at the grain surface of solution‐processed MHP films …”

Section: Resultsmentioning

confidence: 99%

“…It should be noted that mixed‐halide perovskites need more sophisticated passivation because the defects also induce halide segregation which results in pinning of emission wavelength at IR range from iodide‐rich domains . However, up till now, the reported additives in PeLEDs can only passivate one type of defects, either lead or halide defects, while both types of defects coexist in the film . Strategies that simultaneously passivate lead and halide defects are still lacking, limiting the performances and stability of PeLEDs, particularly mixed‐halide PeLEDs.…”

Section: Introductionmentioning

confidence: 99%

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Dual Passivation of Perovskite Defects for Light‐Emitting Diodes with External Quantum Efficiency Exceeding 20%

Fang

Chen

Shi

et al. 2020

Adv Funct Materials

252

210

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Solution‐processed metal halide perovskites (MHPs) have attracted much attention for applications in light‐emitting diodes (LEDs) due to their wide color gamut, high color purity, tunable emission wavelength, balanced electron/hole transportation, etc. Although MHPs are very tolerant to defects, the defects in solution‐processed perovskite LEDs (PeLEDs) still cause severe nonradiative recombination and device instability. Here, molecular design of additives for dual passivation of both lead and halide defects in perovskites is reported. A bi‐functional additive, 4‐fluorophenylmethylammonium‐trifluoroacetate (FPMATFA), is synthesized by using a simple solution process. The TFA anions and FPMA cations can bond with undercoordinated lead and halide ions, respectively, resulting in dual passivation of both lead and halide defects. In addition, the bulky FPMA group can constrain the grain growth of 3D perovskite, enhancing electron–hole capture rates and radiative recombination rates. As a result, high‐performance PeLEDs with a peak external quantum efficiency reaching 20.9% and emission wavelength at 694 nm are achieved using formamidinium‐cesium lead iodide‐bromide (FA0.33Cs0.67Pb(I0.7Br0.3)3). Furthermore, the operational lifetime of PeLEDs is also greatly improved due to the low trap density in the perovskite film.

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“…These defects have relatively small formation energy in MHPs . It should be noted that both halide and lead defects coexist at the grain surface of solution‐processed MHP films …”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dual Passivation of Perovskite Defects for Light‐Emitting Diodes with External Quantum Efficiency Exceeding 20%

Fang

Chen

Shi

et al. 2020

Adv Funct Materials

252

210

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“…When Pb ions (ionic radius of 120 pm) are partially substituted with Ca ions (99 pm), the XRD peaks are expected to have a higher 2 theta angle shift due to shrinkage of the crystal lattice. However, as shown in Figure 1b, the shifts of the (200) peaks are negligible, which is probably due to the minimal doping below the measurement resolution or Ca ions being unincorporated into the crystal lattice 11,24,25. In order to further determine the influence of the CaCl 2 additive contents on the XRD peak position, perovskite films with high concentrations of 3%, 5%, and 10% CaCl 2 additives are prepared.…”

Section: Resultsmentioning

confidence: 99%

Controlled n‐Doping in Air‐Stable CsPbI₂Br Perovskite Solar Cells with a Record Efficiency of 16.79%

Han

Zhao

Duan

et al. 2020

Adv Funct Materials

319

250

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Cesium‐based inorganic perovskites, such as CsPbI2Br, are promising candidates for photovoltaic applications owing to their exceptional optoelectronic properties and outstanding thermal stability. However, the power conversion efficiency of CsPbI2Br perovskite solar cells (PSCs) is still lower than those of hybrid PSCs and inorganic CsPbI3 PSCs. In this work, passivation and n‐type doping by adding CaCl2 to CsPbI2Br is demonstrated. The crystallinity of the CsPbI2Br perovskite film is enhanced, and the trap density is suppressed after adding CaCl2. In addition, the Fermi level of the CsPbI2Br is changed by the added CaCl2 to show heavy n‐type doping. As a result, the optimized CsPbI2Br PSC shows a highest open circuit voltage of 1.32 V and a record efficiency of 16.79%. Meanwhile, high air stability is demonstrated for a CsPbI2Br PSC with 90% of the initial efficiency remaining after more than 1000 h aging in air.

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“…[1][2][3][4][5][6] The certified efficiency of perovskite solar cells (PSCs) has exceeded 24% within the past few years, which is comparable against the silicon-based solar cells. [3,9,10] Efforts have been carried out to improve the stability of PSCs such as solvent engineering, [11][12][13] interface engineering, [14,15] composition engineering, and encapsulation. [3,4,7,8] In comparison with silicon, organic-inorganic halide perovskite is endowed with soft crystal lattice (low formation energy) and prone to decompose when exposed to oxygen, ultraviolet (UV) illumination, hyperthermia, or electric tension.…”

Section: Introductionmentioning

confidence: 99%

Efficient Passivation with Lead Pyridine‐2‐Carboxylic for High‐Performance and Stable Perovskite Solar Cells

Wan

et al. 2019

Advanced Energy Materials

168

127

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Stability has become the main obstacle for the commercialization of perovskite solar cells (PSCs) despite the impressive power conversion efficiency (PCE). Poor crystallization and ion migration of perovskite are the major origins of its degradation under working condition. Here, high‐performance PSCs incorporated with pyridine‐2‐carboxylic lead salt (PbPyA2) are fabricated. The pyridine and carboxyl groups on PbPyA2 can not only control crystallization but also passivate grain boundaries (GBs), which result in the high‐quality perovskite film with larger grains and fewer defects. In addition, the strong interaction among the hydrophobic PbPyA2 molecules and perovskite GBs acts as barriers to ion migration and component volatilization when exposed to external stresses. Consequently, superior optoelectronic perovskite films with improved thermal and moisture stability are obtained. The resulting device shows a champion efficiency of 19.96% with negligible hysteresis. Furthermore, thermal (90 °C) and moisture (RH 40–60%) stability are improved threefold, maintaining 80% of initial efficiency after aging for 480 h. More importantly, the doped device exhibits extraordinary improvement of operational stability and remains 93% of initial efficiency under maximum power point (MPP) tracking for 540 h.

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Cation and anion immobilization through chemical bonding enhancement with fluorides for stable halide perovskite solar cells

Cited by 980 publications

References 46 publications

Dual Passivation of Perovskite Defects for Light‐Emitting Diodes with External Quantum Efficiency Exceeding 20%

Dual Passivation of Perovskite Defects for Light‐Emitting Diodes with External Quantum Efficiency Exceeding 20%

Controlled n‐Doping in Air‐Stable CsPbI₂Br Perovskite Solar Cells with a Record Efficiency of 16.79%

Efficient Passivation with Lead Pyridine‐2‐Carboxylic for High‐Performance and Stable Perovskite Solar Cells

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Cation and anion immobilization through chemical bonding enhancement with fluorides for stable halide perovskite solar cells

Cited by 980 publications

References 46 publications

Dual Passivation of Perovskite Defects for Light‐Emitting Diodes with External Quantum Efficiency Exceeding 20%

Dual Passivation of Perovskite Defects for Light‐Emitting Diodes with External Quantum Efficiency Exceeding 20%

Controlled n‐Doping in Air‐Stable CsPbI2Br Perovskite Solar Cells with a Record Efficiency of 16.79%

Efficient Passivation with Lead Pyridine‐2‐Carboxylic for High‐Performance and Stable Perovskite Solar Cells

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Resources

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Controlled n‐Doping in Air‐Stable CsPbI₂Br Perovskite Solar Cells with a Record Efficiency of 16.79%