Efficient passivation of surface defects by lewis base in lead-free tin-based perovskite solar cells

Yan, Hejin; Wang, Bowen; Yan, Xing; Guan, Qiye; Chen, Hongfei; Shu, Zheng; Wen, Dawei; Cai, Yongqing

doi:10.1016/j.mtener.2022.101038

Cited by 21 publications

(17 citation statements)

References 56 publications

(52 reference statements)

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“…In contrast, no measurable shift of Pb 4 f binding energy was recorded for 10/50 nm‐thick perovskite layer on NiO x /SBTI (Figure 3h), demonstrating that the interface defects are effectively passivated by CO groups of SBTI that act as Lewis bases for defect‐healing by interacting with uncoordinated Pb 2+ . [ 35 ] This chemical environment promotes similar crystal growth conditions at the interface as in the bulk films, thus leading to uniform grain size distribution. Furthermore, the improved interface properties between the perovskite and NiO x with SBTI are advantageous to enhance the quality of perovskite films.…”

Section: Resultsmentioning

confidence: 99%

Dual‐Defect Manipulation Enables Efficient and Spectrally Stable Blue Perovskite Light‐Emitting Diodes

Zhang

Yuan

Kong

et al. 2023

Advanced Optical Materials

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Performance of blue solution-processed perovskite light-emitting diodes (LEDs) is limited by availability of blue perovskite materials. Herein, 4-(trifluoromethyl)benzoyl ammonium bromide (4-TMBABr) is used with abundant N-H and C=O groups to passivate the defects and produce highly stable PEA x PA 2-x (CsPbBr 3 ) n-1 PbBr 4 perovskites for blue LED applications. The N-H group in the 4-TMBABr suppresses the Br-ion mismatch through hydrogen bonds (N-H•••Br) and C=O group coordinates the unsaturated lead dangling bonds (C=O:Pb). The effective defect passivation by 4-TMBABr reduces the nonradiative recombination in the perovskite films, hence enhancing its optical performance. In the LED structure, the sodium bis(trifluoromethanesulfonyl)imide (SBTI) modified NiO x films are used to improve the hole transport and to inhibit the fluorescence quenching of the perovskite layer. The dual-defect manipulation strategy is advantageous for producing efficient and spectrally stable blue perovskite LEDs, and the authors demonstrate an LED with maximum luminance of 1094 cd m −2 and external quantum efficiency of 10.3%. This work can inform and underpin future development of blue perovskite LEDs with highly efficient and stabile performance.

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Section: Resultsmentioning

confidence: 99%

Dual‐Defect Manipulation Enables Efficient and Spectrally Stable Blue Perovskite Light‐Emitting Diodes

Zhang

Yuan

Kong

et al. 2023

Advanced Optical Materials

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“…39–41 The increased crystallinity of the perovskite phase in the DCB-passivated films is likely due to the removal of free PbI 2 and interstitial and uncoordinated Pb 2+ on the surface of the grains and at the grain boundaries. 9,24–29…”

Section: Resultsmentioning

confidence: 99%

Dicyanobenzene passivated perovskite solar cells with enhanced efficiency and stability

Nurzhanov,

Mathur,

et al. 2023

J. Mater. Chem. C

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“…[ 53,61,62 ] XPS and UV–vis were used to study the elemental composition and chemical state of ALD SiAl x O y /SiO 2 . [ 63 ] We found that the optimized low‐temperature ALD process did not cause any damage to the perovskite absorber layer. A series of analyses and tests show that the carrier recombination with a water vapor barrier device is reduced, and the conversion efficiency of the device is increased to 19.16% from 17.08%.…”

Section: Introductionmentioning

confidence: 99%

Low‐Temperature Atomic Layer Deposition of Double‐Layer Water Vapor Barrier for High Humidity Stable Perovskite Solar Cells

Yang

Zhang

et al. 2023

Advanced Optical Materials

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In recent years, remarkable progress has been made in improving the power conversion efficiency of perovskite solar cells, but their long-term stability is not so optimistic. In response to this, ion engineering, interface engineering, and encapsulation engineering have been used to enhance the long-term stability of solar devices. Here, a double-layer water vapor barrier consisting of SiAl x O y buffer layer and SiO 2 vapor isolation layer, prepared by atomic layer deposition under 100 °C, is demonstrated. SiAl x O y layer provides sufficient self-limiting reactive sites for the deposition of SiO 2 , so that a more uniform and dense vapor isolation layer can be deposited. This double-layer water vapor barrier can effectively isolate water vapor to erode the internal functional layers of the perovskite device, prevent ion migration, and improve the long-term stability of the device. Moreover, the SiAl x O y /SiO 2 barrier can be conducive to the transfer of charge between interfaces, and further enhances the conversion efficiency of the device. Overall, compared with the control device, the conversion efficiency of the perovskite device with a double-layer water vapor barrier is increased from 17.08% to 19.16%, and the long-term stability is significantly improved, which can maintain 92% efficiency for 2400 h under 35% humidity at room temperature.

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Efficient passivation of surface defects by lewis base in lead-free tin-based perovskite solar cells

Cited by 21 publications

References 56 publications

Dual‐Defect Manipulation Enables Efficient and Spectrally Stable Blue Perovskite Light‐Emitting Diodes

Dual‐Defect Manipulation Enables Efficient and Spectrally Stable Blue Perovskite Light‐Emitting Diodes

Dicyanobenzene passivated perovskite solar cells with enhanced efficiency and stability

Low‐Temperature Atomic Layer Deposition of Double‐Layer Water Vapor Barrier for High Humidity Stable Perovskite Solar Cells

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