Abstract
Perovskites are a class of recently established materials that triggered enormous interest particularly for solar cell applications. Recent studies have pointed out the extraordinary luminescence quantum yield in perovskite materials. The concept of photon recycling investigated in this work promises a route to reharvest the radiatively emitted photons and, thus, lead to an increase in the open-circuit voltage in perovskite solar cells. In this light, this work investigates the role of nanostructured perovskite absorber layers. While the change of the open-circuit voltage due to photon recycling is understood at a conceptional level, the actual impact of a nanostructured interface on the photon recycling has not yet been studied quantitatively. Here, we rely on full-wave optical simulations to quantify the impact of photon recycling on the open-circuit voltage in a nanotextured biperiodic perovskite thin-film layer and additionally with the perovskite layer integrated into a complete solar cell multilayer stack. The validity of the optical simulations is confirmed by far-field measurements of the emission characteristics from fabricated devices. We find that the considered nanostructure provides around 2% increase to a typically achievable open-circuit voltage in perovskite solar cells. We thereby show that, while the main focus for the design of nanostructures is the optimization of light harvesting, photon recycling might be of interest in future designs of solar cell devices.
Highlights
AND MOTIVATIONHybrid organic-inorganic metal halide perovskites are an outstandingly promising novel material class for thin-film photovoltaics (PV) and light emission devices.1–3 The deposition of such perovskite materials is possible with inexpensive fabrication processes and with low-cost precursor materials.4 the bandgap of these perovskites can be tuned by compositional engineering of the crystal structure
We investigated the impact of nanostructured perovskite regarding the achievable open-circuit voltage enhancement due to photon recycling
We simulated and measured the emission spectrum that occurs in perovskite layers due to electronphoton recombination
Summary
AND MOTIVATIONHybrid organic-inorganic metal halide perovskites (called here perovskites) are an outstandingly promising novel material class for thin-film photovoltaics (PV) and light emission devices. The deposition of such perovskite materials is possible with inexpensive fabrication processes and with low-cost precursor materials. the bandgap of these perovskites can be tuned by compositional engineering of the crystal structure. Hybrid organic-inorganic metal halide perovskites (called here perovskites) are an outstandingly promising novel material class for thin-film photovoltaics (PV) and light emission devices.. Hybrid organic-inorganic metal halide perovskites (called here perovskites) are an outstandingly promising novel material class for thin-film photovoltaics (PV) and light emission devices.1–3 The deposition of such perovskite materials is possible with inexpensive fabrication processes and with low-cost precursor materials.. The bandgap of these perovskites can be tuned by compositional engineering of the crystal structure This makes them suitable for tandem photovoltaics and allows for lighting applications such as lasers and LEDs for a wide range of wavelengths.. For high quality perovskite thin-films, this luminescence is very prominent since the competing parasitic absorption and nonradiative recombination processes are heavily reduced. As a consequence of the dominant radiative recombination, perovskite thin-films feature photon recycling, which describes the process of reabsorption of previously radiatively emitted light in the absorber. Since the open-circuit voltage (Voc) denotes the point of equibalance of photons absorbed by the perovskite absorber layer of a solar cell and the photons recombined (radiatively and nonradiatively) and parasitically absorbed, photon recycling bears the promise to enhance the Voc
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