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Updated: Sep 24, 2025

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
Published on: January 10, 2017
Morphology and carrier non-geminate recombination dynamics regulated by solvent additive in polymer/fullerene solar
Ming-Ming Huo1, Rong Hu2, Qing-Shan Zhang2
1Laser Institute, Qilu University of Technology (Shandong Academy of Sciences) Qingdao Shandong 266100 China yongwang@sdlaser.cn mingminghuo@sdlaser.cn shaoting.chen@sdlaser.cn weiyan@sdlaser.cn.
Abstract:
In this study, PBDTTT-E (based on benzo [1,2-b:4,5-b'] dithiophene (BDT) and thieno [3,4-b] thiophene (TT)) as a donor and fullerene derivative PC71BM (phenyl-C71-butyric acid methyl ester) as an acceptor with and without 1,8-diiodooctane (DIO)-treated copolymer solar cells were investigated. The device based on PBDTTT-E with treated DIO showed remarkably high current density (J sc), fill factor (FF) and similar open-circuit voltage (V oc). Charge carrier lifetime (τ ), density (n) and non-geminate recombination rate (k rec) in the photoactive layers were measured by employing transient photovoltage (TPV) and charge extraction (CE) techniques. Based on k rec and n, J-V curves were reconstructed. The DIO optimized the morphology of the active layer and its PBDTTT-E:PC71BM interfaces were increased. Therefore, compared to the device without the treated DIO, the device with the treated DIO showed larger electron mobility, longer carrier lifetime (τ ) and lower non-geminate recombination rate (k rec), which enhances the carrier transport and restrains the non-geminate recombination, realizing the higher J sc and FF. In addition, that the DIO-treated devices can weaken the role of other factors (such as field dependent geminate recombination) in limiting device performance. The results provide some hints of improved device performance upon DIO as an additive in the D-A type polymer/fullerene solar cells.
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