Rear Interface Engineering to Suppress Migration of Iodide Ions for Efficient Perovskite Solar Cells with Minimized Hysteresis

Xiong, Qiu; Wang, Can; Zhou, Qin; Wang, Luyao; Wang, Xiaobing; Yang, Longkai; Ding, Jiaxin; Chen, Chun‐Chao; Wu, Jihuai; Li, Xin; Gao, Peng

doi:10.1002/adfm.202107823

Cited by 83 publications

(63 citation statements)

References 75 publications

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“…where V TFL is the trap-filled voltage, L is the thickness of perovskite film, ε is the relative dielectric constant, ε 0 is the permittivity of vacuum, e is the elementary charge, and N t is the trap density. [64] The results are shown in Figure 3d boundaries of ITO. [65] However, after introducing NbCl 5 , the buried interface between perovskite and SnO 2 shows a higher count of Clwith lower I -.…”

Section: Resultsmentioning

confidence: 96%

Internal Encapsulation for Lead Halide Perovskite Films for Efficient and Very Stable Solar Cells

Xiao

et al. 2022

Advanced Energy Materials

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Section: Resultsmentioning

confidence: 96%

Internal Encapsulation for Lead Halide Perovskite Films for Efficient and Very Stable Solar Cells

Xiao

et al. 2022

Advanced Energy Materials

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“…[86] Meanwhile, an NdCl 3 interface layer has been demonstrated to interdict the iodine ion migration pathway through filling the initial ion vacancies, leading to reduce trap densities over the whole perovskite region, offering significantly improved photostability. [119] Another research work indicating potassium thiocyanate (KSCN) provides multiple interface passivation effects, which could be a better choice compared with potassium acetate (KAc) and KCl. [61] In addition to potassium passivation, thiocyanate shows two good passivation effects on perovskite and NiO x to achieve triple passivation.…”

Section: Inorganic Salts As Efficient Interface Modification Materialsmentioning

confidence: 99%

Buried Interface Modification in Perovskite Solar Cells: A Materials Perspective

Zuo-ning

Wang

Choy

2022

Advanced Energy Materials

145

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Q limit but the opencircuit voltage (V oc ) and fill factor (FF) are still far below the theoretical values. As we know, both V oc and FF relate to charge carrier dynamics including extraction and transport. Therefore, carrier managements including reducing non-radiative carrier recombination (bulk and interface), series or shunt resistance, and improving carrier extraction and transport are critical to further enhance the power conversion efficiency (PCE) of PSCs. In addition to high efficiency, the stability issues in perovskite must be solved before commercialization.From the standpoint of architecture of PSCs, the PSCs are essentially a heterojunction device with a multilayer construction, which consists of perovskite light absorption layer, carrier transport layer (CTL), and electrodes. [25,30] As a result, the rational design and modification of heterojunction interfaces have become key strategies to harness the full potential of PSCs. [31][32][33][34][35] A lack of in-depth understanding of the heterojunction interfaces and appropriate interface designs, specifically the buried interfaces under polycrystalline perovskite films, is impeding further advancements in perovskite photovoltaic performance and stability. [36][37][38][39][40][41][42] To date, many researches mainly focus on the top surfaces of perovskite. [43][44][45][46][47] However, due to the accumulation of deep-level trap states, it is known that unfavorable non-radiative recombination losses that impede device power outputs exist at the interfaces with bottom contact layers. [41,48] Consequently, it is urgently needed to compromise between these detrimental effects and beneficial effects.However, investigating these issues is more difficult compared with that on the top surfaces of perovskite. There are two kinds of techniques to study the buried interface, which are the in-situ and ex-situ methods. For in-situ method, the sum frequency generation (SFG) vibrational spectroscopy which is a nonlinear interface sensitive spectroscopy is applied to study/ analyze the molecular structure information at the buried interface. [49,50] In addition, the photoluminescence spectroscopy (PL) excited from the glass side can characterize carrier dynamics behavior of buried interface. [51] For ex-situ strategy, the buried interface will expose with a peeling-off method. Then the common characterization methods can be used to analyze exposed the buried surface of perovskite layer, such as PL, scanning electron microscope (SEM), atomic force microscopy (AFM), and Fourier transform infrared spectroscopy (FTIR). [52,53] It is still challenging to find ways to access the buried interfaces to achieve device efficiency limits. [54] Organic-inorganic hybrid perovskite solar cells (PSCs) are promising thirdgeneration solar cells. They exhibit high power conversion efficiency (PCE) and, in theory, can be manufactured with less energy than several more established photovoltaic technologies, particularly solution-processed PSCs. Various materials have been widely utiliz...

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“…With TBP complex, the device provides a champion PCE of 23.03%, with a V oc of 1.165 V, a J sc of 24.50 mA cm −2 , and a FF of 80.70%. In addition, the hysteresis index (HI) reduces from 4.58 to 1.09% [ 45 ]. The enhanced PCE and suppressed hysteresis mainly result from the high quality of the perovskite and the reduced defects in the device, as well as the slight improvement in spiro layer.…”

Section: Resultsmentioning

confidence: 99%

Overcoming Perovskite Corrosion and De-Doping Through Chemical Binding of Halogen Bonds Toward Efficient and Stable Perovskite Solar Cells

et al. 2022

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Abstract4-tert-butylpyridine (TBP) is an indispensable additive for the hole transport layer in highly efficient perovskite solar cells (PSCs), while it can induce corrosion decomposition of perovskites and de-doping effect of spiro-OMeTAD, which present huge challenge for the stability of PSCs. Herein, halogen bonds provided by 1,4-diiodotetrafluorobenzene (1,4-DITFB) are employed to bond with TBP, simultaneously preventing perovskite decomposition and eliminating de-doping effect of oxidized spiro-OMeTAD. Various characterizations have proved strong chemical interaction forms between 1,4-DITFB and TBP. With the incorporation of halogen bonds, perovskite film can maintain initial morphology, crystal structure, and light absorbance; meanwhile, the spiro-OMeTAD film shows a relatively stable conductivity with good charge transport property. Accordingly, the device with TBP complex exhibits significantly enhanced stability in N2 atmosphere or humidity environment. Furthermore, a champion power conversion efficiency of 23.03% is obtained since perovskite is no longer damaged by TBP during device preparation. This strategy overcomes the shortcomings of TBP in n-i-p PSCs community and enhances the application potential of spiro-OMeTAD in fabricating efficient and stable PSCs.

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Rear Interface Engineering to Suppress Migration of Iodide Ions for Efficient Perovskite Solar Cells with Minimized Hysteresis

Cited by 83 publications

References 75 publications

Internal Encapsulation for Lead Halide Perovskite Films for Efficient and Very Stable Solar Cells

Internal Encapsulation for Lead Halide Perovskite Films for Efficient and Very Stable Solar Cells

Buried Interface Modification in Perovskite Solar Cells: A Materials Perspective

Overcoming Perovskite Corrosion and De-Doping Through Chemical Binding of Halogen Bonds Toward Efficient and Stable Perovskite Solar Cells

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