Efficient Inverted Perovskite Solar Cells with Low Voltage Loss Achieved by a Pyridine‐Based Dopant‐Free Polymer Semiconductor

Abstract

Currently,the performance improvement for inverted perovskite solar cells (PVSCs) is mainly limited by the high open circuit voltage (V OC)l oss caused by detrimental nonradiative recombination (NRR) processes.H erein, we report as imple and efficient wayt os imultaneously reduce the NRR processes inside perovskites and at the interface by rationally designing an ew pyridine-based polymer hole-transporting material (HTM), PPY2,w hiche xhibits suitable energy levels with perovskites,high hole mobility,effective passivation of the uncoordinated Pb 2+ and iodide defects,aswell as the capability of promoting the formation of high-quality polycrystalline perovskite films.I na bsence of any dopants,t he inverted PVSCs using PPY2 as the HTM deliver an encouraging PCE up to 22.41 %w ith as mall V OC loss (0.40 V), among the best device performances for inverted PVSCs reported so far. Furthermore, PPY2-based unencapsulated devices showa n excellent long-term photostability,a nd over 97 %o fits initial PCE can be maintained after one sun constant illumination for 500 h.

23.7% Efficient inverted perovskite solar cells by dual interfacial modification

“…For a detailed overview over the recent progress in inverted architecture perovskite solar cells, the readers are referred to several excellent reviews on the topic (10,11). The generally lower performance of inverted architecture perovskite solar cells is mainly associated with a reduced current extraction and nonradiative recombination losses that limit the device photovoltage and fill factor (FF) (12,13). The development of strategies to overcome these limitations has been subject to intense research, including interface and bulk passivation of traps, such as crystallographic defects, point defects, or higher-dimensional defects (at grain boundaries) (14)(15)(16)(17)(18)(19)(20)(21)(22).…”

Resonance‐Mediated Dynamic Modulation of Perovskite Crystallization for Efficient and Stable Solar Cells

“…Metal halide perovskites contribute significantly to the rapid progress of photovoltaic technologies, exhibiting impressive device performance with power conversion efficiencies (PCEs) boosting from 3.8% to 25.5%. [ 1–3 ] Besides the high‐efficiency perovskite solar cells (PSCs) in regular (n–i–p) structures, the inverted (p–i–n structure) PSCs have also drawn extensive attentions due to their reliable operational stability, negligible hysteresis, and low‐temperature fabrication process, [ 4,5 ] which offers great promise for future commercialization. However, stability and scalability issues imped their commercialization.…”

Stable perovskite solar cells with efficiency of 22.6% via quinoxaline-based polymeric hole transport material

“…Conjugated polymers, with their excellent intrinsic stability and easily tunable photoelectric properties, have been used as efficient and stable HTMs for pero-SCs [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49]. In the conjugated polymers, planar structured D-A copolymers composed of an electron-donating (D) unit and an electronaccepting (A) unit possess the advantages of high hole mobility and tunable electronic energy levels by selecting different D-unit and different A-unit with different side chains.…”