Efficient Semitransparent Perovskite Solar Cells Based on Thin Compact Vacuum Deposited CH₃NH₃PbI₃ Films

Abstract

Lead halide perovskite materials are promising candidates for the application of semitransparent solar cells due to their bandgap tunability and high device efficiencies. The high absorption coefficient of these materials, however, makes it difficult to attain high average visible transmittance values without compromising the power conversion efficiencies (PCEs). In this work, a co‐evaporation process is employed to fabricate thin (50 and 100 nm) methylammonium lead iodide (MAPI) perovskite films and integrate them in semitransparent perovskite solar cells (ST‐PSCs). Due to the compact nature of the thin MAPI films, the resultant fully vacuum and room temperature‐processed devices demonstrate high fill factor values approaching 80% and open‐circuit voltage values close to 1100 mV. As a result of this, the ST‐PSCs exhibit PCE's as high as 9% with a photopic average visible transmittance of the full device of 23%.

Facile Preparation of Large-Area, Ultrathin, Flexible Semi-Transparent Perovskite Solar Cells via Spin-Coating

“…Hence, the preparation of sub-100 nm perovskite films with a conformal profile in the wet process is still a challenge. In Table , we provide a summary that compares our results to previously reported solution-processed and thermally evaporated semitransparent perovskite devices. − Here it is worth noting that taking into account active area and flexible substrate our results are unprecedented in terms of PCE and AVT. Furthermore, one should note that considering real-world applications and technological significance our process is the only one which does not require vacuum evaporation or specially prepared substrates.…”

Doping with KBr to Achieve High-Performance CsPbBr3 Semitransparent Perovskite Solar Cells

“…The challenge of PSCs in BIPV lies in concurrently achieving high power conversion efficiency (PCE) and reasonable AVT. 4,5 A common strategy to address this challenge involves the utilization of ultrathin films, 6,7 micropatterned films, 8,9 and wide bandgap films. 10,11 Among these, wide-bandgap semitransparent perovskite, particularly CsPbBr 3 , exhibits nearly 85% transmittance in the visible light range from 530 to 780 nm (Figure S1) and remarkable moisture and heat resistance.…”

“…In recent years, perovskite solar cells (PSCs) have emerged as key applications for building-integrated photovoltaics (BIPV). − According to prevalent standards and regulations governing facade glass curtain walls, an average visible light transmittance (AVT) exceeding 40% is required. The challenge of PSCs in BIPV lies in concurrently achieving high power conversion efficiency (PCE) and reasonable AVT. , A common strategy to address this challenge involves the utilization of ultrathin films, , micropatterned films, , and wide bandgap films. , Among these, wide-bandgap semitransparent perovskite, particularly CsPbBr 3 , exhibits nearly 85% transmittance in the visible light range from 530 to 780 nm (Figure S1) and remarkable moisture and heat resistance. − Consequently, CsPbBr 3 devices can achieve an AVT surpassing 40%, while maintaining a higher PCE.…”

Printable High‐Efficiency and Stable FAPbBr3 Perovskite Solar Cells for Multifunctional Building‐Integrated Photovoltaics

“…[9][10][11] Although impressive progress has been made in the development of semitransparent perovskite solar cells (ST-PSCs), further studies are required for convenient, low-cost, and specially designed PSCs for BIPV. [12] Iodide-based perovskite absorbers (bandgap ≈1.5-1.7 eV), which are normally used to construct ST-PSCs by thickness reduction [13] or forming island-like structures, are not intrinsically transparent for the visible light. [14] Although high device performance can be obtained for perovskite films with thickness of <200 nm and PCE over 14% at AVT of 20%, [15] the thin layer could cause inhomogeneity and stability problems for upscaling.…”

“…Iodide‐based perovskite absorbers (bandgap ≈1.5–1.7 eV), which are normally used to construct ST‐PSCs by thickness reduction [ 13 ] or forming island‐like structures, are not intrinsically transparent for the visible light. [ 14 ] Although high device performance can be obtained for perovskite films with thickness of <200 nm and PCE over 14% at AVT of 20%, [ 15 ] the thin layer could cause inhomogeneity and stability problems for upscaling.…”