Carrier-selective contacts in silicon solar cells

Koswatta, Priyaranga; Boccard, Mathieu; Holman, Zachary C.

doi:10.1109/pvsc.2015.7356143

Cited by 10 publications

(8 citation statements)

References 6 publications

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“…Thus, with increasing overpotentials, the charge separation increasingly relies on the different conductivities for H + and OH – inside of each membrane to establish the required current asymmetry, i.e, σ OH – α · ∇μ̅ OH – α ≫ σ H + α · ∇μ̅ H + α and σ OH – ω · ∇μ̅ OH – ω ≪ σ H + ω · ∇μ̅ H + ω . This situation is similar to a solar cell for which charge carrier-selective contacts are of prime importance for efficient operation. ,, …”

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confidence: 94%

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Ionic Processes in Water Electrolysis: The Role of Ion-Selective Membranes

Oener

Ardo²,

Boettcher

2017

ACS Energy Lett.

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Ionic separation and recombination processes in water electrolysis and fuel cell devices are of equal importance as the electron transfer processes that occur at the electrode surfaces. We illustrate the basic thermodynamic concepts governing the flow of ions in electrolyzer and fuel cell systems and the effects of pH gradients on the electrochemical phenomena. Particularly, we focus on the use of bipolar membranes, which are composed of anion-and cation-selective membranes enabling operation with different pH environments at the anode versus the cathode. The use of bipolar membranes thus broadens the materials' availability and could enable low-cost electrolysis systems that operate at very high efficiency. We end by discussing different materials and highlighting key gaps needed to realize such a system.

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confidence: 94%

“…This situation is similar to a solar cell for which charge carrier-selective contacts are of prime importance for efficient operation. 46,98,99 Figure 5c and d show the chemical potential and electric potential, respectively. At electrochemical equilibrium (black dashed lines), the electric potential compensates the chemical potential fully.…”

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confidence: 99%

Ionic Processes in Water Electrolysis: The Role of Ion-Selective Membranes

Oener

Ardo²,

Boettcher

2017

ACS Energy Lett.

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“…7,16 Also, we showed in Section 3.2 that the approximation of independent pinhole and tunneling currents is appropriate. We therefore verify the remaining blocks of our model independently, that is, the calculation of the tunneling current density J tun and the surface recombination velocity We estimate the normalized bulk resistivity between this base contact (pad 2 in Figure 9) and the junction contact (pad 1 in Figure 9) to ρ series = (100 ± 16) mΩcm 2 . The voltage drop V across the POLO junction is then extracted from the applied voltage V Bias as eters to the fit.…”

Section: Verification Of the Model By Comparison With Experimental mentioning

confidence: 78%

“…The quantification of selectivity of contacts for charge carrier extraction from solar cell absorbers has attracted recent research interest. [1][2][3][4][5] Following the picture of Brendel et al, the ideal contact of a solar cell shows no recombination (as quantified by the recombination parameter J 0 for most contact schemes) and no resistive losses (as quantified by the contact resistance ρ C ). The figure of merit for the efficiency potential of a real, that is, non-ideal contact, the selectivity…”

Section: Introductionmentioning

confidence: 99%

Modeling recombination and contact resistance of poly‐Si junctions

Folchert

Peibst

Brendel

2020

Progress in Photovoltaics

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We present a semi-analytical model for the calculation of the current through and the recombination in carrier-selective junctions consisting of a poly-Si/SiO x /c-Si layer stack. We calculate the recombination parameter J 0 and the contact resistance ρ C after solving the band-bending-problem on both sides of the interfacial oxide. Comparisons with finite-element simulations show that the current calculation is reliable at all bias conditions except for inversion and that current through pinholes is resolved adequately in the model. The model allows a coherent description of lifetime-, current-voltage-and capacitance-voltage measurements performed on a sample with dominant tunneling. We use our model to investigate the influence of oxide thickness and pinhole density on J 0 and ρ C of our state-of-the-art poly-siliconon-oxide (POLO) junctions and demonstrate its usefulness for the optimization of poly-Si based junctions.

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“…9,10 In addition, the use of n or p type a-Si:H (a-Si:H(n), a-Si:H(p)) as a carrier selective layer allows efficient carrier collection. 11 In addition, a transparent conductive oxide film (TCO) such as tin-doped indium oxide(ITO), tungsten-doped indium oxide (IWO) and aluminum-doped zinc oxide (AZO) is used to compensate for the high sheet resistance loss of the n or a-Si:H(p) layer. 9,[12][13][14] The finger and busbar electrodes are formed on the TCO film by screen printing on the photosensitive surface to collect generated carries.…”

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confidence: 99%

Investigation of the Chemical Reaction between Silver Electrodes and Transparent Conductive Oxide Films for the Improvement of Fill Factor of Silicon Heterojunction Solar Cells

Nishihara

Muramatsu²,

Nakamura

et al. 2021

ECS J. Solid State Sci. Technol.

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We evaluated the fill factor (FF) degradation mechanism in silicon heterojunction (SHJ) solar cells with high mobility In2O3 film as a high carrier mobility transparent conductive oxide (TCO) film. In particular, we focused on the electrode formation using a high productive screen-printing technique. We found the In2O3 film is easier to be reduced than the traditional TCO such as tin-doped indium oxide (ITO). Thus, the Ag atom inside the electrode is easily oxidized during the cure annealing process and results in higher contact resistance at electrode/TCO interface and deteriorate FF characteristic. We introduced novel cation catalyst additive for paste polymerization which is less reactive with In2O3 and improve the contact resistance by suppressing the silver oxidation. We also demonstrated SHJ cell fabrication and prove the effect of the developed silver paste.

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Carrier-selective contacts in silicon solar cells

Cited by 10 publications

References 6 publications

Ionic Processes in Water Electrolysis: The Role of Ion-Selective Membranes

Ionic Processes in Water Electrolysis: The Role of Ion-Selective Membranes

Modeling recombination and contact resistance of poly‐Si junctions

Investigation of the Chemical Reaction between Silver Electrodes and Transparent Conductive Oxide Films for the Improvement of Fill Factor of Silicon Heterojunction Solar Cells

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