Abstract

<div class="page" title="Page 45"><div class="layoutArea"><div class="column"><p>The development of various emerging photovoltaic technologies, as classified by the National Renewable Energy Laboratory, has experienced very different rates of progress over the last five to ten years. In particular, two thin-film technologies, quantum dot solar cells and perovskite-based solar cells, have achieved drastically different values for power conversion efficiency as quantum dots have failed to keep up with perovskites. Clearly, the materials are very different, but in order to quantify the discrepancy in efficiency, we focus on measuring the tail of the absorption past the nominal band edge and therefore the Urbach energy of the two materials. We discuss a theoretical relationship between Urbach energy and open circuit voltage based on the original considerations by Shockley and Queisser on the efficiency limits of solar cells.</p></div></div></div>

Highlights

  • The development of various emerging photovoltaic technologies, as classified by the National Renewable Energy Laboratory, has experienced very different rates of progress over the last five to ten years

  • A key issue that arises with most thin Here we will address a fundamental optical property, the films is a low power conversion efficiency compared to Urbach energy, of the two materials

  • Both the path length of the light and lead sulfide quantum dots) that can provide a more within the absorptive layer of the cell and the path length quantitative explanation for the discrepancy in the efficienof electrons excited by the absorbed light decrease in a thin cies seen in the two materials. film, which creates a tension of optimization

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Summary

Introduction

The development of various emerging photovoltaic technologies, as classified by the National Renewable Energy Laboratory, has experienced very different rates of progress over the last five to ten years. A key issue that arises with most thin Here we will address a fundamental optical property, the films is a low power conversion efficiency compared to Urbach energy, of the two materials Both the path length of the light and lead sulfide quantum dots) that can provide a more within the absorptive layer of the cell and the path length quantitative explanation for the discrepancy in the efficienof electrons excited by the absorbed light decrease in a thin cies seen in the two materials.

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