Tandem solar cells are widely considered the industry’s next step in photovoltaics because of their excellent power conversion efficiency. Since halide perovskite absorber material was developed, it has been feasible to develop tandem solar cells that are more efficient. The European Solar Test Installation has verified a 32.5% efficiency for perovskite/silicon tandem solar cells. There has been an increase in the perovskite/Si tandem devices’ power conversion efficiency, but it is still not as high as it might be. Their instability and difficulties in large-area realization are significant challenges in commercialization. In the first part of this overview, we set the stage by discussing the background of tandem solar cells and their development over time. Subsequently, a concise summary of recent advancements in perovskite tandem solar cells utilizing various device topologies is presented. In addition, we explore the many possible configurations of tandem module technology: the present work addresses the characteristics and efficacy of 2T monolithic and mechanically stacked four-terminal devices. Next, we explore ways to boost perovskite tandem solar cells’ power conversion efficiencies. Recent advancements in the efficiency of tandem cells are described, along with the limitations that are still restricting their efficiency. Stability is also a significant hurdle in commercializing such devices, so we proposed eliminating ion migration as a cornerstone strategy for solving intrinsic instability problems.

/pdf/recent-progress-in-perovskite-tandem-solar-cells-236s142z.pdf

Recent Progress in Perovskite Tandem Solar Cells

The photovoltaic effect in a GaAs p-n junction exposed to short laser pulses of the 1.06–3.0 μm spectral range is investigated experimentally. At a low excitation level of 1.06 μm radiation, the intraband single photon absorption of light dominates, and the photoresponse is found to be caused mainly by the hot carriers. As the laser intensity is increased, the photoresponse signal across the junction consists of two components; the hot carrier photovoltage and the classical photovoltage due to electron-hole pair generation resulting from two-photon absorption. The generation-induced photovoltage decreases with the increase in the radiation wavelength following the reduction of the two-photon absorption coefficient, while the carriers are shown to be heated by the intraband light absorption as well as by residual photon energy left over during the electron-hole pair generation. It is established that carrier heating by light reduces conversion efficiency of a solar cell not only via the thermalization process but also due to the competition of the hot carrier and the classical photovoltages which are of opposite polarities.

Hot carrier impact on photovoltage formation in solar cells

Abstract Photovoltage formation across Si p-n junction exposed to laser radiation is experimentally investigated. Illumination of the junction with 1.06 μm wavelength laser radiation leads to formation of classical photovoltage Uphdue to intense electronhole pair generation. When the photon energy is lower than the semiconductor forbidden energy gap, the photovoltage U is found to consist of two components, U = Uf+ Uph. The first Uf is a fast one having polarity of thermoelectromotive force of hot carriers. The second Uphis classical photovoltage with polarity opposite to Uf. It is found that Ufis linearly dependent on laser intensity. The classical photovoltage is established to decrease with the rise of radiation wavelength due to decrease in two-photon absorption coefficient with wavelength. Predominance of each separate component in the formation of the net photovoltage depends on both laser wavelength and intensity

/pdf/photovoltage-formation-across-si-p-n-junction-exposed-to-kf3qnenipf.pdf

Photovoltage Formation Across Si P-N Junction Exposed to Laser Radiation

Photovoltage formation across Si and GaAs p-n junctions exposed to laser radiation is experimentally investigated. When the photon energy is lower than semiconductor forbidden energy gap, the photovoltage is found to consist of two components, U=Uf+ Uph. The first one Ufis fast having polarity of thermoelectromotive force of hot carriers. The second one Uphis slow component of opposite polarity, and it is caused by electron-hole pair generation due to two-photon absorption. Uph was shown to decrease with the rise of radiation wavelength due to diminution of two-photon absorption coefficient with wavelength. Predominance of each separate component in the formation of the net photovoltage depends on both laser wavelength and intensity.

Peculiarities of Photovoltage Formation across p-n Junction under Illumination of Laser Radiation

Triple-cation perovskite/silicon tandem solar cell

Peculiarities of photovoltaic effect in GaAs p–n junction under laser excitation at 10.6 and 1.06 μm wavelengths has been investigated experimentally. When photon energy is far less than the forbidden energy gap, the photovoltage is found to be caused by hot carrier electromotive force. When the junction is illuminated with intense Nd:YAG laser radiation, the photovoltage is recognized to consist of two components, U = U
 f
  + U
 ph
 . The first one U
 f
 is the fast component having polarity of thermoelectromotive force of hot carriers. The second one U
 ph
 is the slow component of opposite polarity, and it is caused by electron–hole pair generation due to two-photon absorption of laser radiation.

Photovoltage formation across GaAs p–n junction under illumination of intense laser radiation

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Photovoltage formation across GaAs p–n junction under illumination of intense laser radiation