In this section, you can access to the latest technical information related to the FUTURE project topic.

Activated Electron?Transport Layers for Infrared Quantum Dot Optoelectronics

Photovoltaic (PV) materials such as perovskites and silicon are generally unabsorptive at wavelengths longer than 1100 nm, leaving a significant portion of the IR solar spectrum unharvested. Small?bandgap colloidal quantum dots (CQDs) are a promising platform to offer tandem complementary IR PV solutions. Today, the best performing CQD PVs use zinc oxide (ZnO) as an electron?transport layer. However, these electrodes require ultraviolet (UV)?light activation to overcome the low carrier density of ZnO, precluding the realization of CQD tandem photovoltaics. Here, a new sol–gel UV?free electrode based on Al/Cl hybrid doping of ZnO (CAZO) is developed. Al heterovalent doping provides a strong n?type character while Cl surface passivation leads to a more favorable band alignment for electron extraction. CAZO CQD IR solar cell devices exhibit, at wavelengths beyond the Si bandgap, an external quantum efficiency of 73%, leading to an additional 0.92% IR power conversion efficiency without UV activation. Conventional ZnO devices, on the other hand, add fewer than 0.01 power points at these operating conditions.

» Author: Jongmin Choi , Jea Woong Jo , F. Pelayo García de Arquer , Yong?Biao Zhao , Bin Sun , Junghwan Kim , Min?Jae Choi , Se?Woong Baek , Andrew H. Proppe , Ali Seifitokaldani , Dae?Hyun Nam , Peicheng Li , Oli

» Reference: doi:10.1002/adma.201801720

» Publication Date: 29/05/2018

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