Thakran, AnjaliAnjaliThakranWang, Yen-YuYen-YuWangPaste, RohanRohanPasteDhage, AtulAtulDhageChen, Yu-TeYu-TeChenHofmann, MarioMarioHofmannLu, Yu-JungYu-JungLuLu, Shih- I.Shih- I.LuCHUNG-HSIN LULin, Yan-DuoYan-DuoLinChu, Chih WeiChih WeiChu2026-03-122026-03-122026-02-1513858947https://www.scopus.com/record/display.uri?eid=2-s2.0-105028355021&origin=resultslisthttps://scholars.lib.ntu.edu.tw/handle/123456789/736266Wide band gap (WBG) perovskites face critical challenges, including intrinsic defects, ion migration and poor interface quality, which collectively lead to instability and significant non-radiative recombination losses. These limitations pose notable challenges to their integration in high-efficiency tandem solar cells, underscoring the urgent need for effective strategies to overcome these drawbacks. We present a comprehensive additive engineering approach, a Lewis-base additive named 4,7-dibromobenzo[c]-1,2,5-thiadiazole (DBBT), to passivate intrinsic defects and stabilize the printed WBG perovskite composition. A noteworthy improvement with appropriate DBBT concentration has been observed, and efficiencies of the printed DMAI0.1FA0.65Cs0.25Pb(I0.80Br0.20)3 perovskite film enhanced from ∼17% to 19%. Moreover, DBBT-treated devices demonstrate exceptional stability, maintaining approximately 90% of their initial performance even after 1000 h. Further, the computational analysis reveals a stable binding configuration of DBBT on the perovskite surface with a favorable adsorption energy and pronounced charge redistribution near the binding site, indicating electron donation from DBBT to Pb-related undercoordinated sites. This further supports defect passivation and the reduced non-radiative recombination observed experimentally. Additionally, we fabricated these high-quality films under ambient conditions with our novel stamp-assisted transfer printing technique. With printing advantage, we achieve outstanding improvement in efficiency, boasting a PCE of 19.15% for single-junction devices and a record-high PCE of 22.32% for heterostructure devices in printed perovskite solar cells. Our work underscores the transformative potential of synergistic additive and processing strategies in advancing the stability and efficiency of WBG perovskites, paving the way for next-generation optoelectronic applications.falseAdditiveHeterostructureNon-radiative lossesPrintingWide band gapjournal article10.1016/j.cej.2026.1731972-s2.0-105028355021