Print Email Facebook Twitter Comparing the Calculated Fermi Level Splitting with the Open-Circuit Voltage in Various Perovskite Cells Title Comparing the Calculated Fermi Level Splitting with the Open-Circuit Voltage in Various Perovskite Cells Author Guo, Dengyang (TU Delft ChemE/Opto-electronic Materials) Caselli, V.M. (TU Delft ChemE/Opto-electronic Materials) Hutter, E.M. (TU Delft ChemE/Opto-electronic Materials) Savenije, T.J. (TU Delft ChemE/Opto-electronic Materials) Date 2019 Abstract While the power conversion efficiency of metal halide perovskite (MHP) solar cells has increased enormously, the open-circuit voltage, V oc , is still below the conceivable limit. Here, we derive the Fermi level splitting, μ F , for various types of noncontacted MHPs, which sets a limit for their achievable V oc , using rate constants and mobilities obtained from time-resolved photoconductivity measurements. Interestingly, we find that for vacuum-evaporated MAPbI 3 and K + -doped (MA,FA,Cs)Pb(I/Br) 3 , the μ F /e values are close to the reported V oc values. This implies that for an improvement of the V oc , charge carrier recombination within the bare perovskite has to be reduced. On the other hand, for MHPs with Cs + and/or Rb + addition, the experimental V oc is still below μ F /e, suggesting that higher voltages are feasible by optimizing the transport layers. The presented approach will help to select which techniques and transport layers are beneficial to improve the efficiency of MHP solar cells. To reference this document use: http://resolver.tudelft.nl/uuid:f67b7b62-de02-478e-baa8-cc88e415e10d DOI https://doi.org/10.1021/acsenergylett.9b00431 ISSN 2380-8195 Source ACS Energy Letters, 4 (4), 855-860 Part of collection Institutional Repository Document type journal article Rights © 2019 Dengyang Guo, V.M. Caselli, E.M. Hutter, T.J. Savenije Files PDF untitled.pdf 1.14 MB Close viewer /islandora/object/uuid:f67b7b62-de02-478e-baa8-cc88e415e10d/datastream/OBJ/view