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The solar cell characterizations covered in this chapter address the electrical power generating capabilities of the cell. Some of these covered characteristics pertain to the workings within the cell structure (e.g., charge carrier lifetimes), while the majority of the highlighted characteristics help establish the macro-performance of the finished solar cell (e.g., spectral response, maximum power output). Specific performance characteristics of solar cells are summarized, while the method(s) and equipment used for measuring these characteristics are emphasized.The most obvious use for solar cells is to serve as the primary building block for creating a solar module. As such, a key pursuit is to manufacture a solar module, or more correctly, to manufacture each unique model or product line of photovoltaic (PV) module, using cells that perform as similarly as possible. To achieve that end, manufacturers conduct quick measurements of mass-produced cells and then allocate them into a few groups or "bins" based on those measurements. The key cell characteristic(s) used for binning are embodied in the cell's electrical current versus voltage (I-V) relationship, Fig. 8.1. From these curves, the cell's maximum power output, short-circuit current , and open-circuit voltage, in particular, are identified.Additional cell parameters and relationships are used to more fully characterize a solar cell. These additional characteristics include, but are not limited to, spectral response, fill factor, series resistance, temperature coefficients, and quantum efficiency. Knowledge of these additional parameters is helpful, for example, when developing, evaluating, and fine tuning a new cell design and manufacturing process. Characterizations that focus on maximizing accuracy, moreover, are especially important for the purpose of creating reference cells. Reference cells serve as transfer standards that can be used by manufacturers and third-party testing
The solar cell characterizations covered in this chapter address the electrical power generating capabilities of the cell. Some of these covered characteristics pertain to the workings within the cell structure (e.g., charge carrier lifetimes), while the majority of the highlighted characteristics help establish the macro-performance of the finished solar cell (e.g., spectral response, maximum power output). Specific performance characteristics of solar cells are summarized, while the method(s) and equipment used for measuring these characteristics are emphasized.The most obvious use for solar cells is to serve as the primary building block for creating a solar module. As such, a key pursuit is to manufacture a solar module, or more correctly, to manufacture each unique model or product line of photovoltaic (PV) module, using cells that perform as similarly as possible. To achieve that end, manufacturers conduct quick measurements of mass-produced cells and then allocate them into a few groups or "bins" based on those measurements. The key cell characteristic(s) used for binning are embodied in the cell's electrical current versus voltage (I-V) relationship, Fig. 8.1. From these curves, the cell's maximum power output, short-circuit current , and open-circuit voltage, in particular, are identified.Additional cell parameters and relationships are used to more fully characterize a solar cell. These additional characteristics include, but are not limited to, spectral response, fill factor, series resistance, temperature coefficients, and quantum efficiency. Knowledge of these additional parameters is helpful, for example, when developing, evaluating, and fine tuning a new cell design and manufacturing process. Characterizations that focus on maximizing accuracy, moreover, are especially important for the purpose of creating reference cells. Reference cells serve as transfer standards that can be used by manufacturers and third-party testing
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