Improved photovoltaic performance of triple-cation mixed-halide perovskite solar cells with binary trivalent metals incorporated into the titanium dioxide electron transport layer

Thambidurai, M.; Foo, Shini; Salim, K. M. Muhammed; Harikesh, Padinhare Cholakkal; Bruno, Annalisa; Jamaludin, Nur Fadilah; Lie, Stener; Mathews, Nripan; Dang, Cuong

doi:10.1039/c9tc00555b

Cited by 39 publications

(16 citation statements)

References 46 publications

(36 reference statements)

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“…In addition, we use the time‐resolved PL mode of our setup to obtain diffraction‐limited PL images across the same area of the sample, providing valuable information about the local dynamics of charge carriers in the perovskite films even though its spatial resolution is lower than that of AFM. A typical time‐resolved PL image is shown in Figure S7, Supporting Information, and reveals a mean PL lifetime of 154.4 ± 43.7 ns, in agreement with previous observations for similar excitation fluences [ 43,44 ] and also an indication of the high quality of the fabricated films (see Experimental Section).…”

Section: Resultssupporting

confidence: 89%

Revealing Nanomechanical Domains and Their Transient Behavior in Mixed‐Halide Perovskite Films

Mela

Poudel

Anaya

et al. 2021

Adv Funct Materials

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Halide perovskites are a versatile class of semiconductors employed for high performance emerging optoelectronic devices, including flexoelectric systems, yet the influence of their ionic nature on their mechanical behavior is still to be understood. Here, a combination of atomic‐force, optical, and compositional X‐ray microscopy techniques is employed to shed light on the mechanical properties of halide perovskite films at the nanoscale. Mechanical domains within and between morphological grains, enclosed by mechanical boundaries of higher Young's Modulus (YM) than the bulk parent material, are revealed. These mechanical boundaries are associated with the presence of bromide‐rich clusters as visualized by nano‐X‐ray fluorescence mapping. Stiffer regions are specifically selectively modified upon light soaking the sample, resulting in an overall homogenization of the mechanical properties toward the bulk YM. This behavior is attributed to light‐induced ion migration processes that homogenize the local chemical distribution, which is accompanied by photobrightening of the photoluminescence within the same region. This work highlights critical links between mechanical, chemical, and optoelectronic characteristics in this family of perovskites, and demonstrates the potential of combinational imaging studies to understand and design halide perovskite films for emerging applications such as photoflexoelectricity.

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Section: Resultssupporting

confidence: 89%

Revealing Nanomechanical Domains and Their Transient Behavior in Mixed‐Halide Perovskite Films

Mela

Poudel

Anaya

et al. 2021

Adv Funct Materials

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“…$1.1 V, [15][16][17] indicating a large V OC deficit of 0.5 V for a PSC having a moderate band gap (E g z 1.6 V), where V OC deficit = E g /q À V OC (q is the elementary charge). The relatively large V OC deficit of PSCs is indicative of high nonradiative recombination losses.…”

Section: Context and Scalementioning

confidence: 99%

Efficient Perovskite Solar Modules with Minimized Nonradiative Recombination and Local Carrier Transport Losses

Ren

Lai

Hao

et al. 2020

Joule

109

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We have developed quantitative and spatially resolved imaging techniques to identify the origin of nonradiative-radiative recombination and carrier transport losses in perovskite solar cells, offering potential for future real-time tracking of the lab-scaled devices and fast assessment of screening the large-area modules. By dual-chloride passivation strategy, the resulting 25.49 cm 2 perovskite solar module achieves a certified power conversion efficiency of 17.88%.

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“…Then 0.15, 0.3, 0.45 and 0.6 mol% of RuCl 3 •xH 2 O were added to the TiO 2 nanopowder (P25) and stirred vigorously for one hour at room temperature (step 1, 2) and then it was dried at 100 • C with continuous stirring for 2 hours (step 3). The product was ground well (step 4) and the resulting Ru-TiO 2 powder mixtures were annealed at 500 • C for 3 h (step 5) ( Figure 1) [26,35,37,38].…”

Section: Preparation Of Ru-doped Tio 2 Nanomaterialsmentioning

confidence: 99%

Ruthenium (Ru) Doped Titanium Dioxide (P25) Electrode for Dye Sensitized Solar Cells

Rajaramanan

Muthukumarasamy²,

Ravirajan

et al. 2020

Energies

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In this study, P25-titanium dioxide (TiO2) was doped with ruthenium (Ru) by systematically varying the Ru content at 0.15, 0.30, 0.45 and 0.6 mol%. The synthesized Ru-doped TiO2 nanomaterials have been characterized by X-ray diffraction (XRD), Raman spectroscopy, energy-dispersive X-ray (EDX) analysis, UV-visible (UV–Vis) spectroscopy, and electrochemical impedance (EIS) spectroscopy. The XRD patterns of undoped and Ru-doped TiO2 nanomaterials confirm the presence of mixed anatase and rutile phases of TiO2 while EDX spectrum confirms the presence of Ti, O and Ru. Further, UV-visible absorption spectra of doped TiO2 nanomaterial reveal a slight red shift on Ru-doping. The short circuit current density (JSC) of the cells fabricated using the Ru-doped TiO2 photoanode was found to be dependent on the amount of Ru present in TiO2. Optimized cells with 0.3 mol% Ru-doped TiO2 electrodes showed efficiency which is 20% more than the efficiency of the control cell (η = 5.8%) under stimulated illumination (100 mWcm−2, 1 sun) with AM 1.5 filter. The increase in JSC resulted from the reduced rate of recombination upon doping of Ru and this was confirmed by EIS analysis.

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Improved photovoltaic performance of triple-cation mixed-halide perovskite solar cells with binary trivalent metals incorporated into the titanium dioxide electron transport layer

Abstract: Simultaneous improvement in transparency, conductivity, and energy level alignment was attained via a highly efficient AlIn-TiO2 ETL with the unrivaled PCE of 19%.

Cited by 39 publications

References 46 publications

Revealing Nanomechanical Domains and Their Transient Behavior in Mixed‐Halide Perovskite Films

Revealing Nanomechanical Domains and Their Transient Behavior in Mixed‐Halide Perovskite Films

Efficient Perovskite Solar Modules with Minimized Nonradiative Recombination and Local Carrier Transport Losses

Ruthenium (Ru) Doped Titanium Dioxide (P25) Electrode for Dye Sensitized Solar Cells

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