Planar‐Structure Perovskite Solar Cells with Efficiency beyond 21%

Abstract

Low temperature solution processed planar-structure perovskite solar cells gain great attention recently, while their power conversions are still lower than that of high temperature mesoporous counterpart. Previous reports are mainly focused on perovskite morphology control and interface engineering to improve performance. Here, this study systematically investigates the effect of precise stoichiometry, especially the PbI contents on device performance including efficiency, hysteresis and stability. This study finds that a moderate residual of PbI can deliver stable and high efficiency of solar cells without hysteresis, while too much residual PbI will lead to serious hysteresis and poor transit stability. Solar cells with the efficiencies of 21.6% in small size (0.0737 cm ) and 20.1% in large size (1 cm ) with moderate residual PbI in perovskite layer are obtained. The certificated efficiency for small size shows the efficiency of 20.9%, which is the highest efficiency ever recorded in planar-structure perovskite solar cells, showing the planar-structure perovskite solar cells are very promising.

A Dopant‐Free Polymeric Hole‐Transporting Material Enabled High Fill Factor Over 81% for Highly Efficient Perovskite Solar Cells

“…Additionally, the hysteresis behavior of the devices based on P3HT and PBT1-C has been illustrated in Figure S8 (Supporting Information). [52][53][54] The PCE value and current density of PBT1-C based cells was also checked by the stabilized power output at the maximum power point (MPP) in Figure 4d, yielding a current density of 21.39 mA cm −2 and PCE of 18.82%, which is consistent with the PCE results of the J-V curve. [52][53][54] The PCE value and current density of PBT1-C based cells was also checked by the stabilized power output at the maximum power point (MPP) in Figure 4d, yielding a current density of 21.39 mA cm −2 and PCE of 18.82%, which is consistent with the PCE results of the J-V curve.…”

Exploring Inorganic Binary Alkaline Halide to Passivate Defects in Low‐Temperature‐Processed Planar‐Structure Hybrid Perovskite Solar Cells

“…[36] Solid-State NMR further pointed that there was no proof of the incorporation of Rb or K into the lattice of the mixed-cation FA X MA (1−X) PbI 3 materials. [17,38] SEM images of perovskite on different underlying KCl substrates are shown in Figure 3. Undoubtedly, these results [11,36,37] made the position and the function of K inside organic-inorganic hybrid perovskite materials more controversial.…”

Μethylammonium Chloride: A Key Additive for Highly Efficient, Stable, and Up‐Scalable Perovskite Solar Cells

“…[16] Nowadays, one can meet only few works on highly performing MAPbI 3 perovskites based on non-iodide lead precursor compounds. [23][24][25][26][27][28][29] These latest results were actually the motivation for us to write this review. To form a properly crystalline iodide or iodide/ bromide, perovskite and achieve high performance in solar cells, sources containing only iodide and bromide salts (PbI 2 , PbBr 2 , MAI, FAI, CsI, MABr) are typically used as precursor materials.…”