Solution-processed carrier selective layers for high efficiency organic/nanostructured-silicon hybrid solar cells

Ying-Shu Kou; Song-Ting Yang; Subramani Thiyagu; Chien-Ting Liu; Jia-Wei Wu; Ching-Fuh Lin

doi:10.1039/c5nr08724d

Solution-processed carrier selective layers for high efficiency organic/nanostructured-silicon hybrid solar cells

Nanoscale. 2016 Mar 7;8(9):5379-85. doi: 10.1039/c5nr08724d.

Authors

Ying-Shu Kou¹, Song-Ting Yang², Subramani Thiyagu¹, Chien-Ting Liu¹, Jia-Wei Wu¹, Ching-Fuh Lin³

Affiliations

¹ Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan, Republic of China. lincf@ntu.edu.tw.
² Graduate Institute of Electronic Engineering, National Taiwan University, 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan.
³ Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan, Republic of China. lincf@ntu.edu.tw and Graduate Institute of Electronic Engineering, National Taiwan University, 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan and Department of Electrical Engineering, National Taiwan University, 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan and Innovative Photonics Advanced Research Center, National Taiwan University, 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan.

PMID: 26882957
DOI: 10.1039/c5nr08724d

Abstract

The reduction of interface minority carrier recombination is regarded as a key performance indicator in improving the power conversion efficiency (PCE) of organic-inorganic hybrid solar cells. In this study, we chose two kinds of carrier-selective layers to be applied in a hybrid solar cell device. A hole selective transporting layer of N,N'-bis(3-methylphenyl)-N,N'-diphenylbenzidine (TPD) was added to the interface between Si nanohole structures and

Pedot: PSS, and the electron selective layer cesium carbonate (Cs2CO3) was added to the interface between the backside Si wafer and the rear Ti/Ag electrode. The main process used a clean and low-cost solution process, and the annealed temperature was under 140 °C. In addition, after we inserted these two carrier selective layers, the minority carrier lifetime was prolonged from 29.98 μs to 140.81 μs, indicating its significance in reducing the recombination rate. Eventually, we demonstrated that the PCE of Si/organic heterojunction solar cells can be improved to 13.23%.

Publication types

Research Support, Non-U.S. Gov't