Approaching the fill factor Shockley-Queisser limit in stable, dopant-free triple cation perovskite solar cells
| Autor: | Yohai Amir, Dieter Neher, Martin Stolterfoht, Pietro Caprioglio, Christian M. Wolff, Andreas Paulke, Lorena Perdigón-Toro |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Shockley–Queisser limit
Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences Environmental Chemistry Figure of merit ddc:530 Perovskite (structure) Photocurrent Dopant Renewable Energy Sustainability and the Environment Chemistry business.industry Energy conversion efficiency Institut für Physik und Astronomie 021001 nanoscience & nanotechnology Pollution 0104 chemical sciences Time of flight Nuclear Energy and Engineering Optoelectronics ddc:520 0210 nano-technology business Voltage |
| Popis: | Perovskite solar cells now compete with their inorganic counterparts in terms of power conversion efficiency, not least because of their small open-circuit voltage (V-OC) losses. A key to surpass traditional thin-film solar cells is the fill factor (FF). Therefore, more insights into the physical mechanisms that define the bias dependence of the photocurrent are urgently required. In this work, we studied charge extraction and recombination in efficient triple cation perovskite solar cells with undoped organic electron/hole transport layers (ETL/HTL). Using integral time of flight we identify the transit time through the HTL as the key figure of merit for maximizing the fill factor (FF) and efficiency. Complementarily, intensity dependent photocurrent and V-OC measurements elucidate the role of the HTL on the bias dependence of non-radiative and transport-related loss channels. We show that charge transport losses can be completely avoided under certain conditions, yielding devices with FFs of up to 84%. Optimized cells exhibit power conversion efficiencies of above 20% for 6 mm(2) sized pixels and 18.9% for a device area of 1 cm(2). These are record efficiencies for hybrid perovskite devices with dopant-free transport layers, highlighting the potential of this device technology to avoid charge-transport limitations and to approach the Shockley-Queisser limit. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|