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Surface Band Bending Influences the Open-Circuit Voltage of Perovskite Solar Cells

Surface Band Bending Influences the Open-Circuit Voltage of Perovskite Solar Cells

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HU, Hao, Susanne BIRKHOLD, Muhammad SULTAN, Azhar FAKHARUDDIN, Susanne KOCH, Lukas SCHMIDT-MENDE, 2019. Surface Band Bending Influences the Open-Circuit Voltage of Perovskite Solar Cells. In: ACS Applied Energy Materials. 2(6), pp. 4045-4052. eISSN 2574-0962. Available under: doi: 10.1021/acsaem.9b00060

@article{Hu2019-06-24Surfa-45970, title={Surface Band Bending Influences the Open-Circuit Voltage of Perovskite Solar Cells}, year={2019}, doi={10.1021/acsaem.9b00060}, number={6}, volume={2}, journal={ACS Applied Energy Materials}, pages={4045--4052}, author={Hu, Hao and Birkhold, Susanne and Sultan, Muhammad and Fakharuddin, Azhar and Koch, Susanne and Schmidt-Mende, Lukas} }

Fakharuddin, Azhar Schmidt-Mende, Lukas Birkhold, Susanne Fakharuddin, Azhar 2019-06-11T09:51:22Z 2019-06-11T09:51:22Z Schmidt-Mende, Lukas Birkhold, Susanne Hu, Hao Koch, Susanne Surface Band Bending Influences the Open-Circuit Voltage of Perovskite Solar Cells Sultan, Muhammad Koch, Susanne Sultan, Muhammad 2019-06-24 Hu, Hao With perovskite solar efficiencies exceeding 23%, more investigations are needed to understand and enhance the open-circuit voltage (V<sub>oc</sub>) for further efficiency gains. Here, by changing the perovskite film annealing conditions, we achieve significant V<sub>oc</sub> variations in a p–i–n cell architecture. While the morphology remains unaffected, we observe that the annealing conditions affect the surface stoichiometry. Subsequent variations in the V<sub>oc</sub> are identified to be caused by differences in trap-assisted recombination processes as well as also largely by the suppression of charge collection due to surface band bending. These findings highlight the impact of surface band bending on V<sub>oc</sub> which can be permanently introduced by normal annealing treatments and impede the charge transport process. Our study suggests that the detailed states of the band bending in perovskite films should be carefully examined and designed to maximize the V<sub>oc</sub> and consecutively improve the performance of perovskite solar cells. eng

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