Surface Treatment of Cu:NiOx Hole-Transporting Layer Using β-Alanine for Hysteresis-Free and Thermally Stable Inverted Perovskite Solar Cells

Galatopoulos, Fedros; Papadas, Ioannis T.; Ioakeimidis, Apostolos; Eleftheriou, Polyvios; Choulis, Stelios A.

doi:10.3390/nano10101961

Cited by 10 publications

(8 citation statements)

References 54 publications

(79 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have reported the solution combustions synthesis of pristine and co-doped (Cu, Li) NiCo 2 O 4 films, applying a 300 • C annealing temperature and incorporating them as high performance HTLs in MAPbI 3 -based inverted perovskite solar cells [38,39]. We have also shown the improvements of PVSC's thermal stability based on SCS Cu:NiO x HTL by treatment of Cu:NiO x with β-alanine, showing a T80 of 1000 h under heat conditions (60 • C, N 2 ), as well as the improvement of humidity degradation resistance for SCS NiO x -based PVSC with the addition of 1% Nitrobenzene within the perovskite active layer [40,41]. Jae Woong Jung et al have reported the solution combustion synthesis of the Cu:NiO x film at 150 • C and implemented it as HTL in MAPbI 3 perovskite solar cell.…”

Section: Introductionmentioning

confidence: 62%

Thermal Analysis of Metal-Organic Precursors for Functional Cu:ΝiOx Hole Transporting Layer in Inverted Perovskite Solar Cells: Role of Solution Combustion Chemistry in Cu:ΝiOx Thin Films Processing

et al. 2021

Self Cite

View full text Add to dashboard Cite

Low temperature solution combustion synthesis emerges as a facile method for the synthesis of functional metal oxides thin films for electronic applications. We study the solution combustion synthesis process of Cu:NiOx using different molar ratios (w/o, 0.1 and 1.5) of fuel acetylacetone (Acac) to oxidizer (Cu, Ni Nitrates) as a function of thermal annealing temperatures 150, 200, and 300 °C. The solution combustion synthesis process, in both thin films and bulk Cu:NiOx, is investigated. Thermal analysis studies using TGA and DTA reveal that the Cu:NiOx thin films show a more gradual mass loss while the bulk Cu:NiOx exhibits a distinct combustion process. The thin films can crystallize to Cu:NiOx at an annealing temperature of 300 °C, irrespective of the Acac/Oxidizer ratio, whereas lower annealing temperatures (150 and 200 °C) produce amorphous materials. A detail characterization study of solution combustion synthesized Cu:NiOx, including XPS, UV-Vis, AFM, and Contact angle measurements, is presented. Finally, 50 nm Cu:NiOx thin films are introduced as HTLs within the inverted perovskite solar cell device architecture. The Cu:NiOx HTL annealed at 150 and 200 °C provided PVSCs with limited functionality, whereas efficient triple-cation Cs0.04(MA0.17FA0.83)0.96 Pb(I0.83Br0.17)3-based PVSCs achieved for Cu:NiOx HTLs for annealing temperature of 300 °C.

show abstract

Section: Introductionmentioning

confidence: 62%

Thermal Analysis of Metal-Organic Precursors for Functional Cu:ΝiOx Hole Transporting Layer in Inverted Perovskite Solar Cells: Role of Solution Combustion Chemistry in Cu:ΝiOx Thin Films Processing

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…While NiO X is used as a p-type metal oxide in PSCs for superior long-term stability compared to organic or polymeric HTM, 52 the instability of NiO X is also frequently reported particularly in the presence of oxygen with varying oxidation states. 53,54 The generated oxygen vacancies in NiO X could induce the photooxidation of the neighboring perovskite film. 55 In Figure S5, PSCs stored in the absence of oxygen still bring a more prominent J SC decrease for NiO X by 6% over 440 h compared to a 1% reduction for pTPD, which underlines that the significant difference in ambient air with humidity (Figure 3(a)) would be dominantly ascribed to the lattice strain effect rather than the difference in substrate.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Enhanced Phase Stability of Compressive Strain-Induced Perovskite Crystals

Lee

Kim

2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Control of strain in perovskite crystals has been considered as an effective strategy to ensure the phase stability of perovskite films where a compressive strain is particularly preferred over a tensile strain due to a lowered Gibbs free energy by the unit cell contraction effect. Here we adapt the strategy of strain control into perovskite solar cells in which the compressive strain is applied by utilizing a thermal expansion difference between the perovskite film and an adjacent layer. Poly(4-butylphenyldiphenylamine), with a higher thermal expansion coefficient compared to that of perovskite, is employed as a substrate for perovskite crystal growth at 100 °C, followed by cooling to room temperature. The applied compressive strain at the interface, as a result of a greater contraction of the polymer compared to the perovskite film, is confirmed by grazing incidence X-ray diffraction showing a red peak shift with increasing secondary angle. The compressive strain-induced perovskite film shows relatively constant absorbance spectra as a function of time. In the meantime, the absorbance spectra of a film without strain control exhibit a gradual decay with developing an Urbach tail. Importantly, the effect of strain engineering is remarkably prominent in the long-term photovoltaic performance. The photocurrent drops by 41% over 911 h without controlling strain, which is significantly improved by employing compressive strain, showing only a 6% drop in photocurrent from a shelf-stability test without encapsulation. It is also noted that an S-shaped kink appears in the current–voltage curves since 579-h-long storage for the device without strain control, leading to unreliable and overestimated fill factor and conversion efficiency. On the other hand, a 16% increase in fill factor with a stable performance is derived over 911 h from the compressive strain-induced device.

show abstract

“…In Figure 6 a, the PL emission peak shifts from 770 nm to 766 nm after GABr treatment, which is in keeping with the absorption spectra. Moreover, the intensity of PL peak of GABr-treated film is much stronger than the pristine film, suggesting a superior film with fewer density of defects and suppressed nonradiative recombination (as shown in Figure 6 b) [ 49 , 50 , 51 ]. The TRPL curve can be fitted by a biexponential equation [ 23 ]: f(t) = A 1 exp(−t/τ 1 ) + A 2 exp(−t/τ 2 ), where τ 1 , τ 2 refer to the fast-decay and long-decay recombination mechanism, A 1 , A 2 are the corresponding coefficients.…”

Section: Resultsmentioning

confidence: 99%

GABr Post-Treatment for High-Performance MAPbI3 Solar Cells on Rigid Glass and Flexible Substrate

Chen

Zhang

et al. 2021

Nanomaterials

View full text Add to dashboard Cite

Perovskite solar cells have exhibited astonishing photoelectric conversion efficiency and have shown a promising future owing to the tunable content and outstanding optoelectrical property of hybrid perovskite. However, the devices with planar architecture still suffer from huge Voc loss and severe hysteresis effect. In this research, Guanidine hydrobromide (GABr) post-treatment is carried out to enhance the performance of MAPbI3 n-i-p planar perovskite solar cells. The detailed characterization of perovskite suggests that GABr post-treatment results in a smoother absorber layer, an obvious reduction of trap states and optimized energy level alignment. By utilizing GABr post-treatment, the Voc loss is reduced, and the hysteresis effect is alleviated effectively in MAPbI3 solar cells. As a result, solar cells based on glass substrate with efficiency exceeding 20%, Voc of 1.13 V and significantly mitigated hysteresis are fabricated successfully. Significantly, we also demonstrate the effectiveness of GABr post-treatment in flexible device, whose efficiency is enhanced from 15.77% to 17.57% mainly due to the elimination of Voc loss.

show abstract

Surface Treatment of Cu:NiOx Hole-Transporting Layer Using β-Alanine for Hysteresis-Free and Thermally Stable Inverted Perovskite Solar Cells

Cited by 10 publications

References 54 publications

Thermal Analysis of Metal-Organic Precursors for Functional Cu:ΝiOx Hole Transporting Layer in Inverted Perovskite Solar Cells: Role of Solution Combustion Chemistry in Cu:ΝiOx Thin Films Processing

Thermal Analysis of Metal-Organic Precursors for Functional Cu:ΝiOx Hole Transporting Layer in Inverted Perovskite Solar Cells: Role of Solution Combustion Chemistry in Cu:ΝiOx Thin Films Processing

Enhanced Phase Stability of Compressive Strain-Induced Perovskite Crystals

GABr Post-Treatment for High-Performance MAPbI3 Solar Cells on Rigid Glass and Flexible Substrate

Contact Info

Product

Resources

About