Efficient and Stable Perovskite Solar Cell with High Open-Circuit Voltage by Dimensional Interface Modification

Abstract

High-efficiency organic–inorganic hybrid perovskite solar cells have experienced rapid development and attracted significant attention in recent years. However, instability to an ambient environment such as moisture is a facile challenge for the application of perovskite solar cells. Herein, 1,8-octanediammonium iodide (ODAI) is employed to construct a two-dimensional modified interface by in situ combined with residual PbI2 on the formamidinium lead iodide (FAPbI3) perovskite surface. The ODA2+ ion seems to lie horizontally on the surface of a three-dimensional perovskite due to its substitution for two FA+ ions, which could protect the bulk perovskite more effectively. The unencapsulated perovskite solar cells showed notably improved stability, which remained 92% of its initial efficiency after storing in an ambient environment for 120 days. In addition, a higher open-circuit voltage of 1.13 V compared to that of the control device (1.04 V) was obtained due to the interface energy level modification and defect passivation. A champion power conversion efficiency of 21.18% was therefore obtained with a stabilized power output of 20.64% at the maximum power point for planar perovskite solar cells.

Surface Passivation of Perovskite Film by Sodium Toluenesulfonate for Highly Efficient Solar Cells

“…Up to now several approaches have been developed to passivate the defects at the surface of perovskite film, including solvent annealing, additive engineering, post‐treatment, and surface modification . In particular, surface modification fulfilled by depositing a modifier layer atop the perovskite layer is facile with no need to change the fabrication process of the perovskite layer and thus has been extensively utilized . Toward this end, different types of modifiers have been developed; among them, organic salts containing ionic organic functional groups are particularly effective due to their high solubilities in organic solvents and facilities in tuning compositions by changing negative‐ or positive‐charged components .…”

Review of Stability Enhancement for Formamidinium‐Based Perovskites

“…So, the planar PSCs could retain 90% of the initial efficiency after 3000 h in air. In addition, 1,8‐octanediammonium iodide (ODAI) is employed to construct a 2D modified interface by in situ combined with residual PbI 2 on the formamidinium lead iodide (FAPbI 3 ) perovskite surface . The ODA 2 + ion lied horizontally on the surface of 3D perovskites, which could protect the bulk perovskite more effectively.…”

Anti‐Oxidizing Radical Polymer‐Incorporated Perovskite Layers and their Photovoltaic Characteristics in Solar Cells

“…Organo‐lead halide perovskite solar cells, which consist of light‐harvesting organo‐lead halide perovskite crystals and charge‐transporting layers, have attracted significant attention because of their tremendously improved photovoltaic conversion efficiencies . The cells, for example, fabricated with perovskite compounds using a mixture cations of methylamine, formamidine, cesium, and rubidium have provided high photovoltaic conversion efficiencies of beyond 20 % owing to their wide light absorption and high‐quality perovskite layer formation .…”

“…Organo-lead halide perovskite solar cells, which consist of light-harvesting organo-lead halide perovskite crystalsa nd charge-transportingl ayers,h ave attracted significant attention because of their tremendously improved photovoltaic conversion efficiencies. [1][2][3][4][5][6][7][8][9][10][11][12][13] The cells, for example, fabricated with perovskite compounds using am ixture cations of methylamine, formamidine, cesium, and rubidium have provided high photovoltaic conversion efficiencies of beyond2 0% owing to their wide light absorption and high-quality perovskite layer formation. [14][15][16] Their facile fabrication processes, light weight and possible flexible structures, and low material costs have also led to discussions on replacing conventionals olar cells with these still developing perovskite cells and utilizing them in a tandem configuration.…”