TY  - JOUR
A1  - Armin, Ardalan
A1  - Chen, Zhiming
A1  - Jin, Yaocheng
A1  - Zhang, Kai
A1  - Huang, Fei
A1  - Shoaee, Safa
T1  - A Shockley-Type polymer
BT  - Fullerene solar cell
JF  - Advanced energy materials
N2  - Charge extraction rate in solar cells made of blends of electron donating/accepting organic semiconductors is typically slow due to their low charge carrier mobility. This sets a limit on the active layer thickness and has hindered the industrialization of organic solar cells (OSCs). Herein, charge transport and recombination properties of an efficient polymer (NT812):fullerene blend are investigated. This system delivers power conversion efficiency of >9% even when the junction thickness is as large as 800 nm. Experimental results indicate that this material system exhibits exceptionally low bimolecular recombination constant, 800 times smaller than the diffusion-controlled electron and hole encounter rate. Comparing theoretical results based on a recently introduced modified Shockley model for fill factor, and experiments, clarifies that charge collection is nearly ideal in these solar cells even when the thickness is several hundreds of nanometer. This is the first realization of high-efficiency Shockley-type organic solar cells with junction thicknesses suitable for scaling up.
KW  - charge transport
KW  - non-Langevin recombination
KW  - organic solar cells
KW  - thick junctions
Y1  - 2018
U6  - https://doi.org/10.1002/aenm.201701450
SN  - 1614-6832
SN  - 1614-6840
VL  - 8
IS  - 7
PB  - Wiley-VCH
CY  - Weinheim
ER  -