Adjusting the Introduction of Cations for Highly Efficient and Stable Perovskite Solar Cells Based on (FAPbI₃)_0.9(FAPbBr₃)_0.1

Abstract

Although the power conversion efficiency (PCE) of perovskite solar cells (PSCs) has increased to 22.7 %, the instability when exposed to moisture and heat has hindered their further practical development. In this study, to gain highly efficient and stable perovskite components, methylammonium (MA), Cs, and Rb cations are introduced into a (FAPbI ) (FAPbBr ) (FA=formamidine) film, which is rarely used because of its poor photovoltaic performance. The effects of different contents of MA, Cs, or Rb cations on the performance of (FAPbI ) (FAPbBr ) films and devices are systematically studied. The results show that the devices with Cs cations exhibit markedly improved photovoltaic performance and stability, attributed to the clearly enhanced quality of films and their intrinsic stability. The (FAPbI ) (FAPbBr ) devices with 10 % Cs show a PCE as high as 19.94 %. More importantly, the unsealed devices retain about 80 % and 90 % of the initial PCE at 85 °C after 260 h and under 45±5 % relative humidity (RH) after 1440 h, respectively, which are better than that with 15 % MA and 5 % Rb under the same conditions. This indicates that a highly efficient and stable perovskite component has been achieved, and PSCs based on this component are expected to promote their further development.

Oriented Crystallization of Mixed‐Cation Tin Halides for Highly Efficient and Stable Lead‐Free Perovskite Solar Cells

“…They attract our eyesights because methylammonium bromide (MABr) is so general in the synthesis of lead halide perovskites. Actually, MABr alloyed lead perovskites ((FAPbI 3 ) 1− x (MAPbBr 3 ) x ) have been discovered to enhance phase stability and crystallinity, [ 3,44 ] to limit ionic drift and charge accumulation, [ 45 ] to improve film qualities by enlarged grain size and decreased pinholes [ 46 ] effectively. Those effects lead to dramatic enhancements of both efficiency and stability of MABr alloyed FAPbI 3 ‐based PSCs.…”

Perylene Diimide‐Based Electron‐Transporting Material for Perovskite Solar Cells with Undoped Poly(3‐hexylthiophene) as Hole‐Transporting Material

“…The studyo fo rganic-inorganic perovskite solarc ells (PVSCs) has made tremendous progress over the past few years, owing to the exceptional photophysical properties of perovskite materials,s uch as high panchromatic absorption, [1] charge carrier diffusionl engths, [2][3][4] and potential for low-cost solution fabrication processing. During the past decade, power conversion efficiencies (PCEs) for PVSCs have thus increased from 3.8 % [5] to over 23 %.…”

The Effect of Constituent Ratios and Varisized Ammonium Salts on the Performance of Two‐Dimensional Perovskite Materials

“…At present, owing to their superior photoelectric properties, perovskite solar cells (PSCs) have been the subject of exceptional research and attention in the photovoltaic field . In a few years, the power conversion efficiency (PCE) has significantly increased .…”

“…At present, owing to their superior photoelectric properties, perovskite solar cells (PSCs) have been the subjecto fe xceptional research and attentioni nt he photovoltaic field. [1][2][3][4][5] In a few years, the powerc onversion efficiency (PCE) has significantly increased. [6,7] In particular,s ince the first all solid-state PSCs were reported in 2012, [8] the PCE has constantly improved and has reachedahighest certified value of 24.2 %, whichc an match those of inorganic solar cells.…”