Open-Circuit Voltage in AlGaAs Solar Cells With Embedded GaNAs Quantum Wells of Varying Confinement Depth

Elborg, Martin; Noda, Takeshi; Sakuma, Yoshiki

doi:10.1109/jphotov.2016.2617040

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…for the application to the device design, one may consider the special case in which the distribution is symmetric ( Furthermore, as already mentioned, Eq. (12) implies that placing the MQW to balance the carrier distribution is an effective approach to suppress the recombination of carriers photogenerated in MQW and hence enhance the photocurrent. Nevertheless, we should keep in mind that the MQW position design in this way may simultaneously degrade the open-circuit voltage Voc, as commonly recognized that the SRH recombination of electrically injected carriers is significantly high at the position where p n ≈ .…”

Section: Output Current Under a Given Spectrummentioning

confidence: 99%

“…In addition, the numerical simulator is not always convenient to see the impact of cell parameters and optimize the cell design. Various analytical expressions have been employed to describe the collection efficiency of the charge carriers from MQWs such as ( ) ( ) is the recombination lifetime, and N is the stack number of QWs [12,13,17,18]. In addition to a variety of expressions, they are over-simplified.…”

Section: Introductionmentioning

confidence: 99%

“…MQWs are usually inserted in the intrinsic regions of the p-i-n junctions, where the internal electric field can enhance the carrier extraction [11]. Still, poor carrier collection has been observed in MQWs that have a large number of stacks and/or large band offsets [9,[11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Investigation and modeling of photocurrent collection process in multiple quantum well solar cells

Toprasertpong

Inoue

Nakano

et al. 2018

Solar Energy Materials and Solar Cells

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Solar cells employing quantum wells can enhance the light absorption but suffer from the difficulty in photogenerated carrier extraction. Here, we analyzed the spectral response and the photocarrier collection mechanism of p-i-n multiple quantum well (MQW) solar cells using the effective-mobility model. Both the simulation and experiment results imply that the spatial profiles of electron and hole densities in MQWs play an important role in the carrier collection process. By considering the recombination increment under illumination, our findings suggest that the concept of the majority/minority carriers is important even in the intrinsic region: photogenerated electrons and holes only experience significant recombination when passing through the hole-rich and electron-rich regions, respectively. This can accurately explain the photocurrent behavior in cells with high background doping, background illumination, and different MQW positions. Based on the experimental findings, we derived analytical formulae for carrier collection efficiency, which directly show the impact of each cell parameter and can be used for the systematic cell design. . For w = 5 nm, the escape rate is boosted by less than 10% under E = 10 kV/cm compared to that under flat-band.

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Section: Output Current Under a Given Spectrummentioning

confidence: 99%