Hutter, E. M., Hofman, J.-J., Petrus, M. L., Moes, M., Abellón, R. D., Docampo, P. and Savenije, T. J. (2017) Charge transfer from methylammonium lead iodide perovskite to organic transport materials: Efficiencies, transfer rates, and interfacial recombination. Advanced Energy Materials, 7(13), 1602349. (doi: 10.1002/aenm.201602349)
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Abstract
Perovskite‐based photovoltaics have been rapidly developed, with record power conversion efficiencies now exceeding 22%. In order to rationally design efficient and stable perovskite solar cells, it is important to understand not only charge trapping and recombination events, but also processes occurring at the perovskite/transport material (TM) interface, such as charge transfer and interfacial recombination. In this work, time‐resolved microwave conductivity measurements are performed to investigate these interfacial processes for methylammonium lead iodide and various state‐of‐the‐art organic TMs. A global kinetic model is developed, which accurately describes both the dynamics of excess charges in the perovskite layer and transfer to charge‐specific TMs. The authors conclude that for state‐of‐the‐art materials, such as Spiro‐OMeTAD and PCBM, the charge extraction efficiency is not significantly affected by intra‐band gap traps for trap densities under 1015 cm–3. Finally, the transfer rates to C60, PCBM, EDOT‐OMeTPA, and Spiro‐OMeTAD are sufficient to outcompete second order recombination under excitation densities representative for illumination by AM1.5.
| Item Type: | Articles |
|---|---|
| Additional Information: | This work was supported by the Netherlands Organization for Scientific Research (NWO) under the Echo grant number: 712.014.007. Andreas Baumann and Philipp Rieder are acknowledged for technical support. The authors thank Davide Bartesaghi for critical reading of this manuscript. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Docampo, Dr Pablo |
| Authors: | Hutter, E. M., Hofman, J.-J., Petrus, M. L., Moes, M., Abellón, R. D., Docampo, P., and Savenije, T. J. |
| College/School: | College of Science and Engineering > School of Chemistry |
| Journal Name: | Advanced Energy Materials |
| Publisher: | Wiley |
| ISSN: | 1614-6832 |
| ISSN (Online): | 1614-6840 |
| Published Online: | 17 February 2017 |
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