The Principle of Detailed Balance and the Opto‐Electronic Properties of Solar Cells

Rau, Uwe; Kirchartz, Thomas

doi:10.1002/9783527665662.ch2

Cited by 3 publications

(3 citation statements)

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“…Spatially resolved maps of parameters such as the ideality factor have been produced, which can be used to understand the recombination mechanisms in a device. In terms of current loss, the optically measured parameter “current transport efficiency” ( f T ) introduced by Wong and Green , is a figure of merit. f T was conceptualized for Si p–n junction cells, defined as the differential ratio of the extracted (δ J ) current to the light-induced current (δ J L ), over an infinitesimally small voltage step, capturing losses in transporting the current from the p–n junction to the load at some voltage bias.…”

mentioning

confidence: 99%

Visualizing Macroscopic Inhomogeneities in Perovskite Solar Cells

et al. 2022

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Despite the incredible progress made, the highest efficiency perovskite solar cells are still restricted to small areas (<1 cm 2 ). In large part, this stems from a poor understanding of the widespread spatial heterogeneity in devices. Conventional techniques to assess heterogeneities can be time consuming, operate only at microscopic length scales, and demand specialized equipment. We overcome these limitations by using luminescence imaging to reveal large, millimeter-scale heterogeneities in the inferred electronic properties. We determine spatially resolved maps of "charge collection quality", measured using the ratio of photoluminescence intensity at open and short circuit. We apply these methods to quantify the inhomogeneities introduced by a wide range of transport layers, thereby ranking them by suitability for upscaling. We reveal that top-contacting transport layers are the dominant source of heterogeneity in the multilayer material stack. We suggest that this methodology can be used to accelerate the development of highly efficient, large-area modules, especially through high-throughput experimentation.

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mentioning

confidence: 99%

Visualizing Macroscopic Inhomogeneities in Perovskite Solar Cells

et al. 2022

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“…Spatially resolved maps of parameters such as the ideality factor have been produced 21 , which can be used to understand the recombination mechanisms in a device. In terms of current loss, the optically measured parameter "current transport efficiency" (𝑓 ( ) introduced by Wong and Green 22,23 as a figure of merit. 𝑓 ( was conceptualised for Si p-n junction cells, defined as the differential ratio of the extracted (𝛿𝐽) current to the light induced current (𝛿𝐽 , ), over an infinitesimally small voltage step, capturing losses in transporting the current from the p-n junction to the load at some voltage bias.…”

Section: Toc Graphicmentioning

confidence: 99%

Visualizing Macroscopic Inhomogeneities in Perovskite Solar Cells

Płochocka

2023

Proceedings of the MATSUS Fall 2023 Conference

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Despite the incredible progress made, the highest efficiency perovskite solar cells are still restricted to small areas (<1 cm 2 ). In large part, this stems from a poor understanding of the widespread spatial heterogeneity in devices. Conventional techniques to assess heterogeneities can be time consuming, operate only at microscopic length scales, and demand specialist equipment. We overcome these limitations by using luminescence imaging to reveal large, millimetre scale heterogeneities in inferred electronic properties.We determine spatially resolved maps of 'charge collection quality', measured using the ratio of photoluminescence intensity at open and short-circuit. We apply these methods to quantify the inhomogeneities introduced by a wide range of transport layers, thereby ranking them by suitability for upscaling. We reveal that top-contacting transport layers are the dominant source of heterogeneity in the multi-layer materials stack. We suggest that

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“…24 for solar modules. It shows that f PC is measureable by determining the change of the local junction voltage dV j ðrÞ caused by a differential change of the terminal voltage dV ext .…”

Section: Small-signal Analysismentioning

confidence: 99%

Analysis of Cu(In,Ga)Se2 thin-film modules by electro-modulated luminescence

Huhn

Gerber

Augarten

et al. 2016

Journal of Applied Physics

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Thin-film Cu(In,Ga)Se2 modules are investigated by electro-modulated luminescence with bias illumination. The large signal analysis enables the determination of the average current density/voltage (J/V) characteristics of individual cell-stripes in a module, without contacting each individual cell. It was found that the characteristics determined from electro-modulated photo-luminescence measurements differ from the characteristics determined without bias illumination via electro-luminescence. As a reason for this, we found the non-linear relation of the local current to the local voltage which makes the determination of the cell voltage via an average of the local voltages determined from electro-luminescence images incorrect especially at high injection currents. A second analysis method using the small signal response of electro-modulated photo-luminescence was also analyzed. Recently, a method based on such a small signal analysis was demonstrated that yields the local photocurrent collection efficiency. This contribution presents the first application of this method to solar modules with series connected cells rather than the previously shown analysis of single cells. We compare two ways to evaluate the photocurrent collection efficiency from the small signal analysis and discuss how applicable these measurements are to modules. We find that the photocurrent collection efficiency of modules gives valuable information about how defective cells act within a module and which parts of the module limit the overall current through the module.

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The Principle of Detailed Balance and the Opto‐Electronic Properties of Solar Cells

Abstract: The SQ-limit derives the maximum solar cell efficiency from macroscopic quantities of the solar cell, namely the absorptance and the temperature. The

Cited by 3 publications

References 88 publications

Visualizing Macroscopic Inhomogeneities in Perovskite Solar Cells

Visualizing Macroscopic Inhomogeneities in Perovskite Solar Cells

Visualizing Macroscopic Inhomogeneities in Perovskite Solar Cells

Analysis of Cu(In,Ga)Se2 thin-film modules by electro-modulated luminescence

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