title: Quantum cutting in Pr3+-Yb3+ codoped chalcohalide glasses for high-efficiency c-Si solar cells.
abstract: Downconversion materials, which can convert one high-energy photon to two low-energy photons, have provided a promising avenue for the enhancement of solar cell efficiency. In this work, the Pr3+-Yb3+ codoped 25GeS2-35Ga2S3-40CsCl chalcohalide glasses were synthesized in a vacuumed silica ampoule by the melting-quenching technique. Under 474 nm excitation, the visible and near-IR emission spectra reveal the energy transfer from Pr3+ to Yb3+ ions, resulting in the intense 1008 nm near-IR emission for the c-Si solar cells. By tuning the excitation laser power, it is determined that one visible photon has been cut into two near-IR photons during the energy transfer process. With the help of an integrated sphere, the real quantum yields of near-IR emissions were calculated. For the 0.2Pr2S3-0.2Yb2S3 (in mol.%) codoped chalcohalide glass, the quantum yield equals 10.8%. Although this efficiency is still low, this result will open a new route to realize the efficient spectral modification of the solar spectrum.
authors: Yin-Sheng
authors: YS
authors: Xu
authors: Fei
authors: F
authors: Huang
authors: Bo
authors: B
authors: Fan
authors: Chang-Gui
authors: CG
authors: Lin
authors: Shi-Xun
authors: SX
authors: Dai
authors: Li-Yan
authors: LY
authors: Chen
authors: Qiu-Hua
authors: QH
authors: Nie
authors: Hong-Li
authors: HL
authors: Ma
authors: Xiang-Hua
authors: XH
authors: Zhang