研究目的
Investigating the influences of the intermediate band (IB) filling, the absorption coefficient constants, and the IB position on the efficiency of a quantum dot intermediate band solar cell (QD-IBSC) considering the spatial variation of subbandgap generation rates.
研究成果
The optimal IB filling becomes a function of the magnitudes of the absorption coefficient constants and the width of the IB region when the spatial variation of the subbandgap generation rates is not negligible. A new definition of the optimal filling is proposed, and a mathematical model is developed to optimize the QD-IBSC structure by finding the optimal values of the IB filling, the ratio of the absorption coefficient constants, and the position of the IB.
研究不足
The study assumes idealized conditions and neglects non-radiative recombinations and thermal generation for simplicity. The bands are considered thermally uncoupled.
1：Experimental Design and Method Selection:
A mathematical model is developed to optimize the IBSC structure under idealized conditions, calculating the optimal ratio of the subbandgap absorption coefficient constants and the optimal position of IB.
2：Sample Selection and Data Sources:
The study uses a base of IBSC structure consisting of multiple InAs quantum dot (QD) layers in GaAs.
3：List of Experimental Equipment and Materials:
The device characteristics are simulated by self-consistently solving one-dimensional carrier continuity equations, Poisson’s equation, and balance equation of intermediate band using the drift-diffusion model.
4：Experimental Procedures and Operational Workflow:
The optical generation and radiative recombination terms are given by specific equations, and the absorption coefficients are dependent on the occupation of the intermediate band states.
5：Data Analysis Methods:
The conversion efficiency of the solar cell is analyzed based on the short-circuit current density, open-circuit voltage, and fill-factor.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
