Details

Autor(en) / Beteiligte

• Swarnkar, Abhishek
• Marshall, Ashley R.
• Sanehira, Erin M.
• Chernomordik, Boris D.
• Moore, David T.
• Christians, Jeffrey A.
• Chakrabarti, Tamoghna
• Luther, Joseph M.

Titel

Quantum dot-induced phase stabilization of α-CsPbI₃ perovskite for high-efficiency photovoltaics

Ist Teil von

• Science (American Association for the Advancement of Science), 2016-10, Vol.354 (6308), p.92-95

Ort / Verlag

United States: American Association for the Advancement of Science

Erscheinungsjahr

2016

Quelle

American Association for the Advancement of Science

Beschreibungen/Notizen

• We show nanoscale phase stabilization of CsPbl₃ quantum dots (QDs) to low temperatures that can be used as the active component of efficient optoelectronic devices. CsPbl₃ is an all-inorganic analog to the hybrid organic cation halide perovskites, but the cubic phase of bulk CsPbl₃ (α-CsPbl₃)—the variant with desirable band gap—is only stable at high temperatures. We describe the formation of α-CsPbl₃ QD films that are phase-stable for months in ambient air. The films exhibit long-range electronic transport and were used to fabricate colloidal perovskite QD photovoltaic cells with an open-circuit voltage of 1.23 volts and efficiency of 10.77%. These devices also function as light-emitting diodes with low turn-on voltage and tunable emission.