NDLI: Understanding of Photophysical Processes in DIO Additive-Treated $PTB7:PC_{71}$BM Solar Cells

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Understanding of Photophysical Processes in DIO Additive-Treated $PTB7:PC_{71}$BM Solar Cells

Content Provider	MDPI
Author	Su, Xiaojun Hu, Rong Wen, Guanzhao Zou, Xianshao Qing, Mengyao Peng, Jun He, Xiaochuan Zhang, Wei
Copyright Year	2021
Description	1,8-diiodooctane (DIO) additive is an important method for optimizing the morphology and device performance of polythieno[3,4-b]-thiophene-co-benzodithiophene (PTB7)-based polymer solar cells. However, the effect of DIO additive on charge photogeneration dynamics of PTB7-based polymer solar cells is still poorly understood. In this work, the effect of DIO additive on the carrier photogeneration dynamics, as well as device performance of PTB7: $[6,6]-phenyl-C_{71}$-butyric acid methyl ester $(PC_{71}$BM) solar cells was studied. Bias-dependent photoluminescence (PL) experiments of a neat PTB7 device show that the exciton cannot be dissociated by the electric field in the device within the operating voltage range, but it can be effectively dissociated by the high electric field. PL and time-resolved PL studies show that DIO additive reduces the phase size of PTB7 in the blend film, resulting in an increased exciton dissociation efficiency. The carrier recombination processes were studied by transient absorption, which shows geminate carrier recombination was suppressed in the DIO-treated $PTB7:PC_{71}$BM device in ultrafast time scale. The increased exciton dissociation efficiency and suppressed carrier recombination in ultrafast time scale play an important role for DIO-treated $PTB7:PC_{71}$BM solar cells to attain a higher power conversion efficiency.
Starting Page	1139
e-ISSN	20734352
DOI	10.3390/cryst11091139
Journal	Crystals
Issue Number	9
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-09-18
Access Restriction	Open
Subject Keyword	Crystals Industrial Engineering Polymer Solar Cells Ptb7:pc71bm Dio Additive Carrier Photogeneration
Content Type	Text
Resource Type	Article

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