Multifunctional molecule interface modification for high-performance inverted wide-bandgap perovskite cells and modules

Abstract

Wide-bandgap (≥1.66 eV) inverted perovskite solar cells (PSCs) are important portions of tandem silicon/PSCs. But the poor efficiency and phase stability are still unresolved and blocking the industrialization of the...

Surface Crystallization Enhancement and Defect Passivation for Efficiency and Stability Enhancement of Inverted Wide-Bandgap Perovskite Solar Cells

“…The processes for fabricating the device with a configuration of ITO/MeO-2PACz/Cs 0.05 (FA 0.77 MA 0.23 ) 0.95 Pb­(I 0.70 Br 0.30 ) 3 /C 60 /BCP/Ag are similar to the previously published work, except that we used a 0.5 mg·mL –1 MeO-2PACz solution and a mixture solution of 0.05 mmol of CsI, 1.09 mmol of FAI, 0.32 mmol of MABr, 0.99 mmol of PbI 2 , and 0.50 mmol of PbBr 2 in 200 μL of DMSO and 800 μL of DMF. The antisolvent is 200 μL CB.…”

“…The PSC they manufactured achieved a PCE of 21.82% for the 1.67 eV bandgap inverted PSCs. 25 Here, we designed and synthesized 1,2,4-tris(3-thienyl)benzene (THB). Due to its appropriate size, S atoms in THB can strongly interact with Pb 2+ on the surface of the WBG perovskite to the maximum extent, and THB effectively passivates surface defects and inhibits the recombination of carriers caused by these defects.…”

“…By binding with the Pb 2+ site on the perovskite surface, the synthesized molecule can fix formamidine (FA + ) and methylammonium (MA + ) cations on the perovskite surface, effectively fill the halogen ion vacancy, and inhibit the halide phase separation, thus reducing the nonradiative recombination. The PSC they manufactured achieved a PCE of 21.82% for the 1.67 eV bandgap inverted PSCs …”

Interface engineering of inverted wide-bandgap perovskite solar cells for tandem photovoltaics

“…They suggested that PI modifies the surface by reducing the excess lead iodide in the perovskite and penetrates the bulk perovskite films. This modification led to WBG PSCs achieving a V oc of 1.36 V, reaching 90% of the radiative limit [83] . Wang et al used a multifunctional molecule, pyridinyl-benzimidazolium chloride (MHI), to stabilize the perovskite surface.…”

Cyclen molecule manipulation for efficient and stable perovskite solar cells

“…Molecule regulation is often used to manipulate Pb-related defects in a perovskite with functional O, S, and P atoms to donate the lone pair of electrons to Pb 2+ ions. 18–22 As a typical molecule, crown ether has been recognized as modifiers or stabilizers in PSCs with a unique ring structure and abundant oxygen chelating with Pb 2+ ions 23–28 to improve the efficiency and stability. Despite the enhancement by crown ethers, most of the devices still suffer from large V oc deficit and unsatisfactory PCE values.…”