Highly Efficient Flexible Hybrid Nanocrystal-Cu(In,Ga)Se-2 (CIGS) Solar Cells

作者：Liao Yu Kuang; Brossard Mael^*; Hsieh Dan Hua; Lin Tzu Neng; Charlton Martin D B; Cheng Shun Jen; Chen Chyong Hua; Shen Ji Lin; Cheng Lung Teng; Hsieh Tung Po; Lai Fang I; Kuo Shou Yi; Kuo Hao Chung; Savvidis Pavlos G; Lagoudakis Pavlos G

来源：Advanced Energy Materials, 2015, 5(2): 1401280.

DOI：10.1002/aenm.201401280

• scattering
• luminescent down shifting
• nanocrystal quantum dots
• hybrid photonics

A novel scheme for hybridizing inkjet-printed thin film Cu(In,Ga)Se-2 (CIGS) solar cells with self-assembled clusters of nanocrystal quantum dots (NQDs), which provides a 10.9% relative enhancement of the photon conversion efficiency (PCE), is demonstrated. A non-uniform layer of NQD aggregates is deposited between the transparent conductive oxide and a CdS/CIGS p-n junction using low cost pulsed-spray deposition. Hybridization significantly improves the external quantum efficiency of the hybrid devices in the absorption range of the NQDs and in the red to near-IR parts of the spectrum. The low wavelength response enhancement is found to be induced by luminescent down-shifting (LDS) from the NQD layer, while the increase at longer wavelengths is attributed to internal scattering from NQD aggregates. LDS is demonstrated using time-resolved spectroscopy, and the morphology of the NQD layer is investigated in fluorescence microscopy and cross-sectional transmission electron microscopy. The influence of the NQD dose on the PCE of the hybrid devices is investigated and an optimum value is obtained. The low costs and limited material consumptions associated with pulsed-spray deposition make these flexible hybrid devices promising candidates to help push thin-film photovoltaic technology towards grid parity.

• 出版日期2015-1-21
• 单位长春大学