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@ARTICLE{Ji:1052856,
      author       = {Ji, Sang-Geun and Noh, Eunseo and Kim, Jongbeom and Duan,
                      Weiyuan and Kang, Bong Joo and Lee, Yonghui and Ding,
                      Kaining and Seok, Sang Il},
      title        = {{C}ooperative {D}ipole {E}ngineering {U}nlocks $92.8\%$
                      {S}hockley–{Q}ueisser {V}oltage {L}imit in
                      {W}ide-{B}andgap {P}erovskites for {T}andem {P}hotovoltaics},
      journal      = {ACS energy letters},
      volume       = {11},
      number       = {1},
      issn         = {2380-8195},
      address      = {Washington, DC},
      publisher    = {American Chemical Society},
      reportid     = {FZJ-2026-01212},
      pages        = {442 - 450},
      year         = {2026},
      abstract     = {Wide-bandgap (WBG) perovskite solar cells (PSCs, Eg ≃
                      1.67 eV) still suffer from pronounced open-circuit-voltage
                      (VOC) deficits. Here, we report a synergistic
                      surface-passivation strategy that coassembles a dipolar
                      quaternary-ammonium salt, acetylcholine chloride (ACCl),
                      with an electron-rich long-chain alkylammonium halide,
                      n-octylammonium iodide (OAI). A mixed ACCl:OAI treatment
                      reconstructs the perovskite surface, lowers surface-trap
                      density, and aligns the valence band with the hole-transport
                      layer. Consequently, the champion WBG PSC delivers VOC =
                      1.29 V, JSC = 20.0 mA cm–2, FF = $82.8\%,$ and PCE =
                      $21.27\%,$ corresponding to $92.8\%$ of the
                      Shockley–Queisser voltage limit. When integrated as the
                      top absorber in a monolithic n-i-p perovskite/p-type Si
                      tandem, the passivated WBG cell contributed to a PCE of
                      $26.8\%$ with a VOC of 1.91 V. These results reveal that
                      cooperative defect passivation and energy-level engineering
                      are both essential to unlock the full voltage potential of
                      WBG perovskites.},
      cin          = {IMD-3},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)IMD-3-20101013},
      pnm          = {1213 - Cell Design and Development (POF4-121)},
      pid          = {G:(DE-HGF)POF4-1213},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001644774500001},
      doi          = {10.1021/acsenergylett.5c02738},
      url          = {https://juser.fz-juelich.de/record/1052856},
}