Interface Modification for Energy Level Alignment and Charge Extraction in CsPbI₃ Perovskite Solar Cells.

ABSTRACT: In perovskite solar cells (PSCs) energy level alignment and charge extraction at the interfaces are the essential factors directly affecting the device performance. In this work, we present a modified interface between all-inorganic CsPbI₃ perovskite and its hole-selective contact (spiro-OMeTAD), realized by the dipole molecule trioctylphosphine oxide (TOPO), to align the energy levels. On a passivated perovskite film, with n-octylammonium iodide (OAI), we created an upward surface band-bending at the interface by TOPO treatment. This improved interface by the dipole molecule induces a better energy level alignment and enhances the charge extraction of holes from the perovskite layer to the hole transport material. Consequently, a V_oc of 1.2 V and a high

SUBMITTER: Iqbal Z 

PROVIDER: S-EPMC10580311 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature