Perovskite Solar Cells Yielding Reproducible Photovoltage of 1.20 V
Essa A. Alharbi,
M. Ibrahim Dar,
Neha Arora,
Mohammad Hayal Alotaibi,
Yahya A. Alzhrani,
Pankaj Yadav,
Wolfgang Tress,
Ahmed Alyamani,
Abdulrahman Albadri,
Shaik M. Zakeeruddin,
Michael Grätzel
Affiliations
Essa A. Alharbi
Laboratory of Photonics and Interfaces,Institute of Chemical Sciences and Engineering,École Polytechnique Fédérale de Lausanne,Lausanne CH-1015,Switzerland
M. Ibrahim Dar
Laboratory of Photonics and Interfaces,Institute of Chemical Sciences and Engineering,École Polytechnique Fédérale de Lausanne,Lausanne CH-1015,Switzerland
Neha Arora
Laboratory of Photonics and Interfaces,Institute of Chemical Sciences and Engineering,École Polytechnique Fédérale de Lausanne,Lausanne CH-1015,Switzerland
Mohammad Hayal Alotaibi
National Nanotechnology Research Centre,King Abdulaziz City for Science and Technology (KACST),P.O. Box 6086,Riyadh 11442,Saudi Arabia
Yahya A. Alzhrani
National Nanotechnology Research Centre,King Abdulaziz City for Science and Technology (KACST),P.O. Box 6086,Riyadh 11442,Saudi Arabia
Pankaj Yadav
Laboratory of Photonics and Interfaces,Institute of Chemical Sciences and Engineering,École Polytechnique Fédérale de Lausanne,Lausanne CH-1015,Switzerland
Wolfgang Tress
Laboratory of Photonics and Interfaces,Institute of Chemical Sciences and Engineering,École Polytechnique Fédérale de Lausanne,Lausanne CH-1015,Switzerland
Ahmed Alyamani
National Center for Petrochemicals Technology,King Abdulaziz City for Science and Technology (KACST),P.O. Box 6086,11442 Riyadh,Saudi Arabia
Abdulrahman Albadri
National Center for Petrochemicals Technology,King Abdulaziz City for Science and Technology (KACST),P.O. Box 6086,11442 Riyadh,Saudi Arabia
Shaik M. Zakeeruddin
Laboratory of Photonics and Interfaces,Institute of Chemical Sciences and Engineering,École Polytechnique Fédérale de Lausanne,Lausanne CH-1015,Switzerland
Michael Grätzel
Laboratory of Photonics and Interfaces,Institute of Chemical Sciences and Engineering,École Polytechnique Fédérale de Lausanne,Lausanne CH-1015,Switzerland
High photovoltages and power conversion efficiencies of perovskite solar cells (PSCs) can be realized by controlling the undesired nonradiative charge carrier recombination. Here, we introduce a judicious amount of guanidinium iodide into mixed-cation and mixed-halide perovskite films to suppress the parasitic charge carrier recombination, which enabled the fabrication of >20% efficient and operationally stable PSCs yielding reproducible photovoltage as high as 1.20 V. By introducing guanidinium iodide into the perovskite precursor solution, the bandgap of the resulting absorber material changed minimally; however, the nonradiative recombination diminished considerably as revealed by time-resolved photoluminescence and electroluminescence studies. Furthermore, using capacitance-frequency measurements, we were able to correlate the hysteresis features exhibited by the PSCs with interfacial charge accumulation. This study opens up a path to realize new record efficiencies for PSCs based on guanidinium iodide doped perovskite films.
