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Correlating high power conversion efficiency of PTB7 [electronic resource] : PC <sub>71</sub> BM inverted organic solar cells with nanoscale structures

Published
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Additional Creators
Argonne National Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Advances in material design and device engineering led to inverted organic solar cells (i-OSCs) with superior power conversion efficiencies (PCEs) compared to their “conventional” counterparts, in addition to the well-known better ambient stability. Here, we report an in-depth morphology study of the i-OSC active and cathode modifying layers, employing a model system with a wellestablished bulk-heterojunction, PTB7:PC71BM as the active layer and poly-[(9,9-bis(3’-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] (PFN) as the cathode surface modifyinglayer. We have also identified the role of a processing additive, 1,8-diiodooctane (DIO), used in the spin-casting of the active layer to increase PCE. Using various characterization techniques, we demonstrate that the high PCEs of i-OSCs are due to the diffusion of electron-accepting PC71BM into the PFN layer, resulting in improved electron transport. The diffusion occurs when residual solvent molecules in the spun-cast film act as a plasticizer. Addition of DIO to the casting solution results in more PC71BM diffusion and therefore more efficient electron transport. This work provides important insight and guidance to further enhancement of i-OSC performance by materials and interface engineering.
Report Numbers
E 1.99:1352519
Subject(s)
Note
Published through SciTech Connect.
06/16/2015.
"123743"
Nanoscale 7 38 ISSN 2040-3364; NANOHL AM
Das, Sanjib; Keum, Jong; Browning, James; Gu, Gong; Yang, Bin; Dyck, Ondrej; Do, Changwoo; Chen, Wei; Chen, Jihua; Ivanov, Ilia; Hong, Kunlun; Rondinone, Adam; Joshi, Pooran; Geohegan, David; Duscher, Gerd; Xiao, Kai.
Funding Information
AC02-06CH11357
View MARC record | catkey: 24061720