Summary of materials important for carrier multiplication process.

What is it about?

Carrier multiplication is a process of making more than one charge carrier per absorbed photon. This process can boost the photovoltaic efficiency of a standard solar cell beyond the current limits. We discuss the spectroscopic signatures of carrier multiplication in emerging materials.

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Why is it important?

The review explains different spectroscopic techniques (transient absorption and terahertz spectroscopy) to investigate carrier multiplication, and provides basic ideas in simple terms.