An efficient post-treatment strategy with acetylacetone for low temperature CsPbI2Br solar cells

Wang, Jixi; Liu, Yangbiao; Xiao, Xurui; Bi, Zhongnan; Lü, Yuan; Sheng, Guizhang; Cai, Xuesong; Zhu, Yanqing; Xu, Xueqing; Xu, Gang

doi:10.1016/j.solener.2020.12.066

Cited by 16 publications

(12 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The minimum root mean square (RMS) roughness calculated from AFM images (Figure 3d-e) decreased from 30.74 nm (W/T) to 18.86 nm (ACAC) and 12.96 nm (ACAC-EDA), which would promote contact of the perovskite layer with the upper C60 electron transport layer (ETL). [30] As shown in Figure S7, the thicknesses of the perovskite layers of W/T, ACAC, and ACAC-EDA were 234 nm, 226 nm, and 215 nm, respectively. A slight decrease in the thickness of the perovskite layer was observed after passivation.…”

Section: Methodsmentioning

confidence: 95%

“…First, the ACAC treatment can enlarge the grain size via Ostwald ripening effects, as reported in the literature. [30] The unstable small perovskite grains will be and the solutes will be separated out, promoting large grain growth, as characterized in the SEM/AFM result. In addition, C=O will also passivate the surface defects of the perovskite film, and EDA treatment after ACAC passivation will stabilize the perovskite against oxidation and reduce the Sn 4 + on the surface.…”

Section: Methodsmentioning

confidence: 98%

“…reported that the incorporation of ACAC additive into the perovskite solution improves the crystallinity, surface coverage, and performance [28, 29] . ACAC was also applied before the annealing process for CsPbI 2 Br to reduce the surface defect density and suppress recombination [30] . Obviously, application of ACAC is an efficient method to enhance the perovskite crystal quality for high J sc .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sequential Passivation for Lead‐Free Tin Perovskite Solar Cells with High Efficiency

et al. 2022

View full text Add to dashboard Cite

Lead‐free tin perovskite solar cells (PKSCs) have attracted tremendous interest as a replacement for toxic lead‐based PKSCs. Nevertheless, the efficiency is significantly low due to the rough surface morphology and high number of defects, which are caused by the fast crystallization and easy oxidization. In this study, a facile and universal posttreatment strategy of sequential passivation with acetylacetone (ACAC) and ethylenediamine (EDA) is proposed. The results show that ACAC can reduce the trap density and enlarge the grain size (short‐circuit current (Jsc) enhancement), while EDA can bond the undercoordinated tin and regulate the energy level (open‐circuit voltage (Voc) enhancement). A promising 13 % efficiency is achieved with better stability. In addition, other combinations of diketones or amines are selected, with similar effects. This study provides a universal strategy to enhance the crystallinity and passivate defects while fabricating stable PKSCs with high efficiency.

show abstract

Section: Methodsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sequential Passivation for Lead‐Free Tin Perovskite Solar Cells with High Efficiency

et al. 2022

View full text Add to dashboard Cite

show abstract

“…proposed a low‐temperature solution method (90 °C) to prepare CsPbI 2 Br films, which increased the grain size and passivated the surface defect by exploiting the strong interaction between the carbonyl group (CO) at both terminals of the acetylacetone (AA) solution and the Pb 2+ cation (Figure 4d). [ 102 ] Meanwhile, good contact between the CsPbI 2 Br film and the HTL was achieved. As a result, the nonradiative charge recombination was suppressed and the device efficiency was promoted.…”

Section: Defect Passivation On Perovskite Layermentioning

confidence: 99%

Recent Progress on Defect Passivation of All‐Inorganic Halide Perovskite Solar Cells

Wang

Yin

Iqbal

et al. 2022

Adv Materials Inter

View full text Add to dashboard Cite

high charge mobility and higher power conversion efficiency (PCE). [1][2][3][4][5] Nowadays, the maximum PCE of organic-inorganic hybrid perovskite solar cells (PSCs) has exceeded 25%. [6][7][8] However, organic cations in organic-inorganic hybrid perovskite materials are susceptible to volatilization by light, heat and other environmental factors, which severely impairs the performance and stability of the devices and hinders their maximum commercial utilization, [9][10][11] while all-inorganic perovskite exhibits excellent thermal and photostability due to the absence of unstable organic cations. Therefore, the development of all-inorganic PSCs is promising to consider the long-term application of the devices on the commercialization path. In recent years, more and more efforts have been focused on the performance enhancement of all-inorganic PSCs, and the PCEs have increased from 2.9% in 2015 to 21.0% in 2022. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] To better visualize the development of defect passivation strategies for all-inorganic PSCs, we have drawn the efficiency development diagram for the all-inorganic halide PSCs including devices based on pure CsPbI 3 , CsPbBr 3 , and CsPbI 3−x Br x . Besides, the number of publications of these PSCs in recent years is also summarized. (Figure 1a,b).The different halide contents make all-inorganic perovskite (CsPbX 3 ) each have distinct advantages as well as disadvantages. For example, black cubic phase α-CsPbI 3 with a bandgap of 1.73 eV, achieved the highest PCE (21.0%) among all kinds of CsPbX 3 solar cells, [28] but it is effortless to transform rapidly to tetragonal phase β-CsPbI 3 (E g = 2.82 eV) under atmospheric humidity (room temperature), or even to yellow δ non-perovskite phase. CsPbI 3 perovskite is a yellow hexagonal δ-phase at room temperature, which is not suitable for photovoltaic applications. However, the photoactive black cubic phase CsPbI 3 can only keep stable at high temperature of above 300 °C. Although it has been recently reported that doping inside CsPbI 3 perovskite pseudohalide (SCN − ) can enhance the phase stability and device performance of CsPbI 3 , the preparation temperature is still as high as 180 °C. [29] Generally, the phase stability of CsPbI3 still is an important problem that needs to be solved.Compared to CsPbI 3 , CsPbBr 3 exhibits excellent humidity and thermal stability; nevertheless, its large band gap (E g = 2.30 eV), limits the corresponding devices only absorb photons with a maximum wavelength of 540 nm. [30] Therefore, All-inorganic halide perovskite materials have attracted increasing attentions in recent years due to their superior stability and adjustable band gap which make them very suitable for the top cells of multi-junction solar cells. Nonetheless, the power conversion efficiency of all-inorganic halide perovskite solar cells is still far from satisfaction. The widespread use of the conventional solution method in the preparation process causes many different defects and carrier t...

show abstract

“…[ 12 ] By contrast, mixed halide perovskites (CsPbI 3− x Br x ) have received great attention by balancing the bandgap and the phase stability. [ 13,14 ] Among them, the bandgap of CsPbI 2 Br is 1.92 eV, but it is not easy to improve the humidity stability, CsPbI 2 Br perovskite will still degrade to form a yellow phase at ambient humidity. CsPbIBr 2 has a slightly wide bandgap (2.05 eV) and excellent humidity stability, which is advantageous for the fabrication of all‐inorganic PSCs.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the NiO_x/Au Interface via Postannealing of the All‐Inorganic CsPbIBr₂ Perovskite Solar Cells for High Efficiency

et al. 2021

Self Cite

View full text Add to dashboard Cite

All‐inorganic perovskite solar cells (PSCs) have been demonstrated to solve the thermal instability problem of organic–inorganic hybrid PSCs. Therefore, NiO x film is prepared by electron beam evaporation as a hole transport layer of all inorganic CsPbIBr2 PSCs. Then, the postannealing is used to promote the diffusion of NiO x into the gold electrode, and enhance interface contact and reducing the electrical resistance of NiO x /Au. After optimizing NiO x /Au interface, the devices based on NiO x achieved a power conversion efficiency (PCE) of 6.7%. Furthermore, the best all‐inorganic CsPbIBr2 PSC free of encapsulation retains 95% of initial efficiency over 100 h at 85 °C. Herein, an effective postannealing strategy is provided for optimized NiO x /Au interface to make stable and efficient all‐inorganic CsPbIBr2 PSCs.

show abstract

An efficient post-treatment strategy with acetylacetone for low temperature CsPbI2Br solar cells

Cited by 16 publications

References 30 publications

Sequential Passivation for Lead‐Free Tin Perovskite Solar Cells with High Efficiency

Sequential Passivation for Lead‐Free Tin Perovskite Solar Cells with High Efficiency

Recent Progress on Defect Passivation of All‐Inorganic Halide Perovskite Solar Cells

Optimizing the NiO_x/Au Interface via Postannealing of the All‐Inorganic CsPbIBr₂ Perovskite Solar Cells for High Efficiency

Contact Info

Product

Resources

About

An efficient post-treatment strategy with acetylacetone for low temperature CsPbI2Br solar cells

Cited by 16 publications

References 30 publications

Sequential Passivation for Lead‐Free Tin Perovskite Solar Cells with High Efficiency

Sequential Passivation for Lead‐Free Tin Perovskite Solar Cells with High Efficiency

Recent Progress on Defect Passivation of All‐Inorganic Halide Perovskite Solar Cells

Optimizing the NiOx/Au Interface via Postannealing of the All‐Inorganic CsPbIBr2 Perovskite Solar Cells for High Efficiency

Contact Info

Product

Resources

About

Optimizing the NiO_x/Au Interface via Postannealing of the All‐Inorganic CsPbIBr₂ Perovskite Solar Cells for High Efficiency