%0 Journal Article %1 singh2018unraveling %A Singh, Ranbir %A Suranagi, Sanjaykumar R. %A Lee, Jaewon %A Lee, Hansol %A Kim, Min %A Cho, Kilwon %D 2018 %J Scientific Reports %K PDI nonfullerene %N 1 %P 2849-- %R 10.1038/s41598-018-21162-x %T Unraveling the efficiency-limiting morphological issues of the perylene diimide-based non-fullerene organic solar cells %U https://doi.org/10.1038/s41598-018-21162-x %V 8 %X Herein we report a comparative morphological analysis of the perylene diimide (PDI)- and fullerene-based organic solar cells (OSCs) to identify the factors responsible for low performance of PDI-based devices. A PDI derivative, bis-PDI, and a fullerene derivative, PC70BM, are mixed with an efficient polymer donor, PffBT4T-2OD. The large disparity in power conversion efficiencies (PCEs) of OSCs composed of PffBT4T-2OD:bis-PDI (PCE = 5.18%) and PffBT4T-2OD:PC70BM (PCE = 10.19%) observed are attributed to differences in the nanostructural motif of bulk heterojunction (BHJ) morphologies of these blend systems. The X-ray scattering and surface energy characterizations revealed that the structurally dissimilar bis-PDI and PC70BM molecules determine the variation in blend film morphologies, and in particular, the molecular packing features of the donor PffBT4T-2OD polymer. In addition, high-resolution transmission electron microscopy (HRTEM) images explore the BHJ morphologies and presence of longer polymer fibrils in PffBT4T-2OD:bis-PDI system, justifying the unbalanced charge transport and high hole mobility. The low performance of PffBT4T-2OD:bis-PDI devices was further investigated by studying charge carrier recombination dynamics by using light-intensity-dependent and transient photovoltage (TPV) experiments. Furthermore, the temperature-dependent experiments showed the photovoltaic properties, including charge recombination losses, are strongly affected by energetic disorder present in bis-PDI-based system.

@article{singh2018unraveling, abstract = {Herein we report a comparative morphological analysis of the perylene diimide (PDI)- and fullerene-based organic solar cells (OSCs) to identify the factors responsible for low performance of PDI-based devices. A PDI derivative, bis-PDI, and a fullerene derivative, PC70BM, are mixed with an efficient polymer donor, PffBT4T-2OD. The large disparity in power conversion efficiencies (PCEs) of OSCs composed of PffBT4T-2OD:bis-PDI (PCE = 5.18%) and PffBT4T-2OD:PC70BM (PCE = 10.19%) observed are attributed to differences in the nanostructural motif of bulk heterojunction (BHJ) morphologies of these blend systems. The X-ray scattering and surface energy characterizations revealed that the structurally dissimilar bis-PDI and PC70BM molecules determine the variation in blend film morphologies, and in particular, the molecular packing features of the donor PffBT4T-2OD polymer. In addition, high-resolution transmission electron microscopy (HRTEM) images explore the BHJ morphologies and presence of longer polymer fibrils in PffBT4T-2OD:bis-PDI system, justifying the unbalanced charge transport and high hole mobility. The low performance of PffBT4T-2OD:bis-PDI devices was further investigated by studying charge carrier recombination dynamics by using light-intensity-dependent and transient photovoltage (TPV) experiments. Furthermore, the temperature-dependent experiments showed the photovoltaic properties, including charge recombination losses, are strongly affected by energetic disorder present in bis-PDI-based system.}, added-at = {2018-04-20T14:34:39.000+0200}, author = {Singh, Ranbir and Suranagi, Sanjaykumar R. and Lee, Jaewon and Lee, Hansol and Kim, Min and Cho, Kilwon}, biburl = {https://www.bibsonomy.org/bibtex/2ebcc2fe908cd48a80b46a073ca99c62d/martinstreiter}, doi = {10.1038/s41598-018-21162-x}, interhash = {c721e4319b587de41d64c91d6c6ec833}, intrahash = {ebcc2fe908cd48a80b46a073ca99c62d}, issn = {20452322}, journal = {Scientific Reports}, keywords = {PDI nonfullerene}, number = 1, pages = {2849--}, refid = {Singh2018}, timestamp = {2018-04-20T14:34:39.000+0200}, title = {Unraveling the efficiency-limiting morphological issues of the perylene diimide-based non-fullerene organic solar cells}, url = {https://doi.org/10.1038/s41598-018-21162-x}, volume = 8, year = 2018 }