Abstract
Metal-halide perovskite-based tandem solar cells show great promise for overcoming the Shockley–Queisser single-junction efficiency limit via low-cost tandem structures, but so far, they employ conventional bottom-cell materials that require stringent processing conditions. Meanwhile, difficulty in achieving low-bandgap ( 11% absolute gain) to the ultimate efficiency via photon recycling. We report an initial experimental demonstration of a solution-processed monolithic perovskite/CQD tandem solar cell, showin...
Highlights
Metal-halide perovskite-based tandem solar cells show great promise for overcoming the Shockley−Queisser single-junction efficiency limit via low-cost tandem structures, but so far, they employ conventional bottom-cell materials that require stringent processing conditions
The current photovoltaic industry is dominated by conventional single-junction silicon (Si) solar cells that exhibit practical efficiencies of up to ∼25%, and further efficiency enhancements are constrained by the Shockley−Queisser (SQ) limit of ∼30%.1−3 The industry seeks alternatives to go beyond this threshold
We demonstrate an initial experimental realization of such a solar cell and model the performance of a tandem cell made from the highest-performing perovskite and colloidal quantum dot (CQD) solar cells available
Summary
Extend the absorption edge further to harvest lower-energy photons (Figure 1a). Favorably, both CQD and perovskite material families are known to be highly luminescent.[26−31] We model below that the radiative coupling between the two subcell materials can critically influence the tandem cell performance. As perovskites and CQDs are luminescent materials,[26−31] it is important to consider the radiative coupling between the two subcells while ensuring current matching for a monolithic tandem cell, as modeled in eqs 1−4. On the basis of the empirical performance of the individual cells obtained in our laboratory a 1.55 eV bandgap perovskite cell with reduced active layer thickness for current matching (blue curve) and a 1.03 eV bandgap PbS cell (red curve) we anticipate a monolithic tandem cell to exhibit a VOC of 1.20 V, JSC of 11.33 mA/cm[2], fill factor (FF) of 0.57, and overall PCE of 7.8% (Figure 3c black dotted curve and Table 1) without considering any radiative coupling to give a conservative estimate.
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