Benefits of Lambertian light distribution across widely deployed photovoltaic materials

Irvin, Nicholas P.; Babcock, Sean J.; Chen, Eric; King, Richard R.; Honsberg, Christiana B.

doi:10.1117/12.2543935

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“…Emittance is taken as equal to absorptance at each energy and angle as per Kirchhoff's law. 1 The absorptances in various situations here are derived from the general form in Green 70 and were previously presented in Irvin et al 71 For planar cells, the front absorptance and emittance is…”

Section: Eqe Depends On Both Photon Absorption and Carrier Collectionmentioning

confidence: 99%

Feedback between radiation and transport in photovoltaics

Irvin

Babcock

Chen

et al. 2022

Progress in Photovoltaics

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By building on the generalized Hovel model, this work develops an analytical solution to unify photon recycling, light trapping, and carrier transport in solar cells. Enhanced transport due to photon recycling diffusion is considered. While photon recycling diffusion is often negligible, it can significantly support transport in cases where charge diffusion is low but radiative efficiency is high. Next, the diffusion equation is solved to determine carrier collection for planar and textured cells. Results elucidate novel features in the external quantum efficiency (EQE) curve that occur for textured cells with high absorption and limited transport. Then, the effect of limited transport on the radiative recombination of solar cells is investigated in detail. While the traditional treatment of detailed balance uses the applied voltage to calculate a cell's radiative recombination, the present approach uses the spatially resolved quasi‐Fermi‐level splitting (QFLS). The discrepancy between the models is shown to be inconsequential to performance for cells with low radiative recombination (Si) or with high mobilities (lowly doped GaAs). However, for cells with high radiative recombination and low mobility (highly doped GaAs, polycrystalline CdTe, and thin‐film perovskites), incorporating variation in QFLS in the determination of radiative recombination can become necessary for accurate photovoltaic modeling.

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Section: Eqe Depends On Both Photon Absorption and Carrier Collectionmentioning

confidence: 99%