Passivated perovskite crystallization and stability in organic–inorganic halide solar cells by doping a donor polymer

Abstract

Photovoltaic performance of planar perovskite solar cells has been improved by mixing CH3NH3PbIxCl3−x and a donor polymer [N-9′′-hepta-decanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiaz-ole)].

Defects Passivation With Dithienobenzodithiophene‐based π‐conjugated Polymer for Enhanced Performance of Perovskite Solar Cells

“…The binding energies of Pb 4f7/2 and Pb 4f5/2 are 138.5 and 143.4 eV, respectively, in the perovskite film prepared by the CB anti‐solvent whereas that of Pb 4f7/2 and Pb 4f5/2 are 138.3 and 143.1 eV, respectively, in the perovskite film prepared by the polymer containing anti‐solvent, exhibiting a shift in binding energy. Many research groups have reported that interaction between perovskite and other materials could lead to changing surface states of perovskite films and Pb 4f binding energy . Zhang et al observed the Pb 4f binding energy shifted to a lower value after introducing Poly[N‐9'‐heptadecanyl‐2,7‐carbazole‐alt‐5,5‐(4',7'‐di‐2‐thienyl‐2',1',3' −benzothiadiazole)] (PCDTBT) into perovskite film .…”

“…Many research groups have reported that interaction between perovskite and other materials could lead to changing surface states of perovskite films and Pb 4f binding energy . Zhang et al observed the Pb 4f binding energy shifted to a lower value after introducing Poly[N‐9'‐heptadecanyl‐2,7‐carbazole‐alt‐5,5‐(4',7'‐di‐2‐thienyl‐2',1',3' −benzothiadiazole)] (PCDTBT) into perovskite film . Privitera et al found that introducing Poly(3‐hexylthiophene‐2,5‐diyl) (P3HT) into perovskite to form nanocomposite could lead to reducing the binding energy of Pb 4f, which is attributed to the excess of negative charges on the perovskite/P3HT nanocomposites due to an electronic interaction between the perovskite and the P3HT .…”

Low-temperature, simple and efficient preparation of perovskite solar cells using Lewis bases urea and thiourea as additives: stimulating large grain growth and providing a PCE up to 18.8%

“…[12][13][14] The incorporation of additive has been recognized as an efficient methodology to increase the performance of PSCs. [15][16][17][18] Previous reports have demonstrated that incorporating diiodooctane (DIO), NH 4 Cl 19,20 and alkylammonium iodides 11,21 can increase the performance of PSC devices. Furthermore, the inserting of bulky cations can induce formation of 2D perovskites, which has been shown to improve the stability of PSCs.…”

Defect Engineering toward Highly Efficient and Stable Perovskite Solar Cells

“…PCDTBT : Zhang et al used an electron donor polymer PCDTBT in CH 3 NH 3 PbI x Cl 3− x and observed it can help to reduce the film defects . The PCDTBT signifies [N‐9″‐hepta‐decanyl‐2,7‐carbazole‐alt‐5,5‐(4′,7′‐di‐2‐thienyl‐2′,1′,3′‐benzothiadiaz‐ole)], which is a common p‐type material used in organic polymer solar cells.…”

“…b) With the addition of PCDTBT in perovskites films and the interaction between PCDTBT and CH 3 NH 3 PbI x Cl 3− x . Reproduced with permission . Copyright 2017, Royal Society of Chemistry.…”