Design and Simulation for Minimizing Non-Radiative Recombination Losses in CsGeI2Br Perovskite Solar Cells

CsGeI2Br-based perovskites, with their favorable band gap and high absorption coefficient, are promising candidates for the development of efficient lead-free perovskite solar cells (PSCs). However, bulk and interfacial carrier non-radiative recombination losses hinder the further improvement of pow...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2024-10, Vol.14 (20), p.1650
Main Authors: Zhou, Tingxue, Huang, Xin, Zhang, Diao, Liu, Wei, Li, Xing’ao
Format: Article
Language:English
Subjects:
Absorptivity
Boundary conditions
Bulk density
Carrier recombination
CsGeI2Br
defects
Efficiency
Energy conversion efficiency
Lead free
Mathematical models
non-radiative recombination
numerical simulation
perovskite solar cells
Perovskites
Photovoltaic cells
Photovoltaics
R&D
Radiation
Radiative recombination
Recombination
Research & development
Shunt resistance
Simulation
Solar cells
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Summary:CsGeI2Br-based perovskites, with their favorable band gap and high absorption coefficient, are promising candidates for the development of efficient lead-free perovskite solar cells (PSCs). However, bulk and interfacial carrier non-radiative recombination losses hinder the further improvement of power conversion efficiency and stability in PSCs. To overcome this challenge, the photovoltaic potential of the device is unlocked by optimizing the optical and electronic parameters through rigorous numerical simulation, which include tuning perovskite thickness, bulk defect density, and series and shunt resistance. Additionally, to make the simulation data as realistic as possible, recombination processes, such as Auger recombination, must be considered. In this simulation, when the Auger capture coefficient is increased to 10−29 cm6 s−1, the efficiency drops from 31.62% (without taking Auger recombination into account) to 29.10%. Since Auger recombination is unavoidable in experiments, carrier losses due to Auger recombination should be included in the analysis of the efficiency limit to avoid significantly overestimating the simulated device performance. Therefore, this paper provides valuable insights for designing realistic and efficient lead-free PSCs.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano14201650