How Do Surface Polar Molecules Contribute to High Open-Circuit Voltage in Perovskite Solar Cells?

ABSTRACT: To date, the improvement of open-circuit voltage (V_OC ) offers a breakthrough for the performance of perovskite solar cells (PSCs) toward their theoretical limit. Surface modification through organic ammonium halide salts (e.g., phenethylammonium ions PEA⁺ and phenmethylammonium ions PMA⁺ ) is one of the most straightforward strategies to suppress defect density, thereby leading to improved V_OC . However, the mechanism underlying the high voltage remains unclear. Here, polar molecular PMA⁺ is applied at the interface between perovskite and hole transporting layer and a remarkably high V_OC of 1.175 V is obtained which corresponds to an increase of over 100 mV in comparison to the control device. It is revealed that the equiva

SUBMITTER: Ma Y 

PROVIDER: S-EPMC10265051 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature