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Pseudohalide-Exchanged Quantum Dot Solids Achieve Record Quantum Efficiency in Infrared Photovoltaics.

Bin SunOleksandr VoznyyHairen TanPhilipp StadlerMengxia LiuGrant WaltersAndrew H ProppeMin LiuJames FanTaotao ZhuangJie LiMingyang WeiJixian XuYounghoon KimSjoerd HooglandEdward H Sargent
Published in: Advanced materials (Deerfield Beach, Fla.) (2017)
Application of pseudohalogens in colloidal quantum dot (CQD) solar-cell active layers increases the solar-cell performance by reducing the trap densities and implementing thick CQD films. Pseudohalogens are polyatomic analogs of halogens, whose chemistry allows them to substitute halogen atoms by strong chemical interactions with the CQD surfaces. The pseudohalide thiocyanate anion is used to achieve a hybrid surface passivation. A fourfold reduced trap state density than in a control is observed by using a suite of field-effect transistor studies. This translates directly into the thickest CQD active layer ever reported, enabled by enhanced transport lengths in this new class of materials, and leads to the highest external quantum efficiency, 80% at the excitonic peak, compared with previous reports of CQD solar cells.
Keyphrases
  • solar cells
  • single cell
  • cell therapy
  • molecular dynamics
  • stem cells
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  • room temperature
  • energy transfer
  • quantum dots
  • case control
  • monte carlo