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 Voc of 1.2 V and a high-power conversion efficiency (PCE) of over 19% were achieved for inorganic CsPbI3 perovskite solar cells. Further, to demonstrate the effect of the TOPO dipole molecule, we present a layer-by-layer charge extraction study by a transient...
Interface Modification for Energy Level Alignment and Charge Extraction in CsPbI3 Perovskite Solar Cells / Iqbal, Z.; Zu, F.; Musiienko, A.; Gutierrez-Partida, E.; Kobler, H.; Gries, T. W.; Sannino, G. V.; Canil, L.; Koch, N.; Stolterfoht, M.; Neher, D.; Pavone, M.; Munoz-Garcia, A. B.; Abate, A.; Wang, Q.. - In: ACS ENERGY LETTERS. - ISSN 2380-8195. - 8:10(2023), pp. 4304-4314. [10.1021/acsenergylett.3c01522]
Interface Modification for Energy Level Alignment and Charge Extraction in CsPbI3 Perovskite Solar Cells
Iqbal Z.;Sannino G. V.;Pavone M.;Munoz-Garcia A. B.;Wang Q.
2023
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 Voc of 1.2 V and a high-power conversion efficiency (PCE) of over 19% were achieved for inorganic CsPbI3 perovskite solar cells. Further, to demonstrate the effect of the TOPO dipole molecule, we present a layer-by-layer charge extraction study by a transient...I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
