期刊
THIN SOLID FILMS
卷 669, 期 -, 页码 482-486出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2018.11.017
关键词
Bandgap; External quantum efficiency; Thin film solar cell; Open circuit voltage deficit; Band gap; Derivative; External radiative efficiency
类别
资金
- Swiss State Secretariat for Education, Research and Innovation [SBFI] [REF-1131-52107]
- European Union [641004, 720907]
- Swiss Federal Office of Energy [SFOE] [SI/501614-01]
- Swiss National Science Foundation [SNF] [200021_160025/1, NRP70 'PV2050', IZLIZ2_157140/1]
- Swiss National Science Foundation (SNF) [IZLIZ2_157140, 200021_160025] Funding Source: Swiss National Science Foundation (SNF)
Knowledge of the absorber bandgap is often needed for assessing the junction quality of a thin film solar cell, for example when computing the open-circuit voltage deficit. The bandgap is typically estimated from the routine measurement of the external quantum efficiency (EQE) of finished devices. However the extraction becomes ambiguous in the case of very thin absorbers, or in presence of bandgap gradients or collection issues of charge carriers. This work reviews several methods for the determination of the bandgap from EQE measurements and discusses their validity conditions. The numerical results are compared based on experimental EQE of several different thin film solar cells such as CuInGaSe2, CuInSe2, CdTe, CuZnSnSe and perovskite, and systematic trends are identified. Numerical simulations are also performed to illustrate the behavior of the different bandgap extraction methods in presence of a bandgap gradient and different magnitudes of the exponential tail states.
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