A review of characterization of perovskite film in solar cells by spectroscopic ellipsometry

Li, Huihui; Cui, Changcai; Xu, Xiao Lan; Bian, Subiao; Ngaojampa, Chanisorn; Ruankham, Pipat; Jaroenjittchai, Atchara Punya

doi:10.1016/j.solener.2020.10.066

Cited by 27 publications

(18 citation statements)

References 86 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[21] Ellipsometry has previously been employed in the study of lead halide perovskites as reviewed recently by Li et.al. [22] The method offers several advantages including fast, non-destructive measurements that are sensitive to optical constants and the thickness of layered samples. Because it measures the reflective differences among polarized light at various wavelengths and angles, it is generally insensitive to disturbances by environmental light.…”

Section: Introductionmentioning

confidence: 99%

In Situ Ellipsometry Measurements on the Halide Phase Segregation of Mixed Halide Lead Perovskites**

et al. 2022

View full text Add to dashboard Cite

Methylammonium lead iodide bromides MAPb(BrxI1‐x)3 are a class of mixed halide lead perovskites, materials that offer high‐power conversion efficiencies and bandgap tunability. For these reasons, they are a promising absorber material for future solar cells, although their use is still limited due to several factors. The reversible phase segregation under even low light intensities is one of them, lowering the effective bandgap due to local segregation into iodide‐rich and bromide‐rich phases. While several studies have been done to illuminate the mechanism and suppression of phase segregation, challenges remain to understand its kinetics. We obtained dynamic ellipsometric measurements from x=0.5 mixed halide lead perovskite thin films protected by a polystyrene layer under green laser light with a power density of ∼11 W/cm2. Time constants between 1.7(±0.7)×10−3 s−1 for the segregation and 1.5(±0.6)×10−4 s−1 for recovery were calculated. The phase segregation rate constants are surprisingly two orders of magnitude slower than and the recovery rate is consistent with those measured using photoluminescence methods under similar conditions. These results confirm a concern in the literature about the complexity in the phase separation kinetics measured from photoluminescence. We expect ellipsometry to serve as a complementary technique to other spectroscopies in studying mixed‐halide lead perovskites phase segregation in the future.

show abstract

Section: Introductionmentioning

confidence: 99%

In Situ Ellipsometry Measurements on the Halide Phase Segregation of Mixed Halide Lead Perovskites**

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Differences in the aging of the perovskite could also impact the comparison. Finally, various dispersion models can be used to fit the dielectric function, [ 70 ] leading to differences that also impact the optical indices that are used for simulations.…”

Section: Key Ppsc Materials and Architecturesmentioning

confidence: 99%

Light Management in Perovskite Photovoltaic Solar Cells: A Perspective

Berry

Mermet-Lyaudoz

Davila

et al. 2022

Advanced Energy Materials

View full text Add to dashboard Cite

configuration, a net performance increase was recently demonstrated compared to single junction PPSC. [6] As for any optoelectronic device, light management in PPSC is of primary importance in attaining the best performance. As schematized in Figure 1, LM is expected to impact three key performance parameters: i) impinging sunlight can be efficiently collected and then absorbed leading to high J sc , ii) V oc can be enhanced as a result of the so-called photon recycling (PR), [7] provided there is strong external luminescence, [8] and the semiconductor exhibits weak non-radiative recombinations, iii) the energy yield (EY) that tends to replace the two previous criteria usually considered under standard test conditions (STC). However, for the latter, requested studies remain complex because they couple illumination models and angular-dependent optical, thermal, and electrical models of the cell for one year. [9,10] Nonetheless, simply considering the incidence angle in the evaluation of absorption and thus J sc is a first step toward EY improvement.As illustrated in Figure 1, the LM in PPSC results from three interdependent considerations: the photonic engineering (PE) at the wavelength scale, the material choices, and the nanofabrication processes. In practice, the last two directly define the PPSC architecture.In brief, regardless of the envisaged semiconductor, the LM can invoke several kinds of PE. Most frequently, the LM results in anti-reflection (AR) over the whole absorbed spectral range, leading to a larger J sc as well as possibly larger EY if the AR effect also occurs over a wide angular domain. Moreover, beyond the AR effects, light trapping (LT) mechanisms can be involved at the band edge of the perovskite material, also leading to a larger J sc , [11,12] whereas enhanced PR can enhance V oc [13] because of the absorption suppression just above the band gap under the previously mentioned conditions. This well-established PE is reviewed in more detail in Section 4.2. The LM could even be extended to the infrared domain to possibly limit the parasitic sub-band gap absorption and enhance the thermal radiation, to decrease the operating temperature. [14] Finally, for the specific case of 2T tandem PPSC, the LM is required to ensure concurrent absorption optimization and current matching between the two cells.In the specific case of metal-halide perovskites, intrinsic properties make these materials particularly relevant for LT, compared to the standard case of c-Si solar cells. First, metal-halide perovskites are direct band gap semiconductors, Light management is essential for metal-halide perovskite solar cells to achieve record performance. In this review, criteria on materials, processes, and photonic engineering are established to enhance primarily the short circuit current density for high energy yields. These criteria are used to analyze a large panel of solutions envisaged in the literature for single junction cells. In addition, a perspective acquired from rigorous electromagnetic simulations per...

show abstract

“…Differences of aging of the perovskite could also impact the comparison. Finally, various dispersion models can be used to fit the dielectric function [62], leading to differences that also impact the optical indices that are used for simulations.…”

Section: Perovskite Mediummentioning

confidence: 99%

Light Management in Perovskite Photovoltaic Solar Cells: a perspective

Berry¹,

Mermet-Lyaudoz²,

Davila³

et al. 2022

Preprint

View full text Add to dashboard Cite

Light Management (LM) is essential for metal-halide perovskite solar cells in their race for record performance. In this review, criteria on materials, processes and photonic engineering are established such as to enhance mainly the short circuit current density, towards high energy yields. These criteria are used to analyse a large panel of solutions envisaged in the literature for single junction cells. Moreover, a perspective based on rigorous electromagnetic simulations performed on various comparable structures is proposed in order to clarify the conclusions, and to pave the way to further performance enhancement in the case of all-perovskite, two-terminal tandem cells.

show abstract

A review of characterization of perovskite film in solar cells by spectroscopic ellipsometry

Cited by 27 publications

References 86 publications

In Situ Ellipsometry Measurements on the Halide Phase Segregation of Mixed Halide Lead Perovskites**

In Situ Ellipsometry Measurements on the Halide Phase Segregation of Mixed Halide Lead Perovskites**

Light Management in Perovskite Photovoltaic Solar Cells: A Perspective

Light Management in Perovskite Photovoltaic Solar Cells: a perspective

Contact Info

Product

Resources

About