@article{luginbuhl_ko_ran_hu_becwar_karki_seifrid_okubo_wang_ade_et al._2022, title={Low Voltage-Loss Organic Solar Cells Light the Way for Efficient Semitransparent Photovoltaics}, volume={3}, ISSN={["2367-198X"]}, url={https://doi.org/10.1002/solr.202200135}, DOI={10.1002/solr.202200135}, abstractNote={Organic solar cells that are transparent to visible light are highly desirable for applications such as window treatments or solar greenhouse panels. A key challenge is to simultaneously transmit most photons between 400 and 700 nm while retaining a high short‐circuit current and power conversion efficiency (PCE). Here, organic bulk heterojunction (BHJ) solar cells consisting of a donor polymer (PM2) is reported and the non‐fullerene acceptor ITIC‐Th achieves a PCE of 9.3%, and the BHJ thin films exhibit an average visible transmittance over 40%. This value is achieved primarily due to a very high open‐circuit voltage (VOC) of 0.93 V, which represents a voltage loss of only 0.50 V relative to the material optical bandgap, Eopt. In PM2:PC61BM devices, this voltage loss increases to 0.62 V (VOC = 0.82 V). It is found that this difference in VOC is due to higher nonradiative recombination in the fullerene‐based solar cell, suggesting that non‐fullerene acceptors may lead to better performance in semi‐transparent devices. The optoelectronic properties associated with PM2:ITIC‐Th and PM2:PC61BM blends are further corroborated by different morphological features and local structures at the donor‐acceptor interfaces characterized by atomic force microscopy, X‐ray scattering, and solid‐state NMR spectroscopy techniques.}, journal={SOLAR RRL}, publisher={Wiley}, author={Luginbuhl, Benjamin R. and Ko, Seo-Jin and Ran, Niva A. and Hu, Huawei and Becwar, Shona M. and Karki, Akchheta and Seifrid, Martin and Okubo, Takashi and Wang, Ming and Ade, Harald W. and et al.}, year={2022}, month={Mar} }
 @article{ghasemi_balar_peng_hu_qin_kim_rech_bidwell_mask_mcculloch_et al._2021, title={A molecular interaction-diffusion framework for predicting organic solar cell stability}, volume={20}, ISSN={["1476-4660"]}, DOI={10.1038/s41563-020-00872-6}, abstractNote={Rapid increase in the power conversion efficiency of organic solar cells (OSCs) has been achieved with the development of non-fullerene small-molecule acceptors (NF-SMAs). Although the morphological stability of these NF-SMA devices critically affects their intrinsic lifetime, their fundamental intermolecular interactions and how they govern property-function relations and morphological stability of OSCs remain elusive. Here, we discover that the diffusion of an NF-SMA into the donor polymer exhibits Arrhenius behaviour and that the activation energy E a  scales linearly with the enthalpic interaction parameters χ H  between the polymer and the NF-SMA. Consequently, the thermodynamically most unstable, hypo-miscible systems (high χ) are the most kinetically stabilized. We relate the differences in E a  to measured and selectively simulated molecular self-interaction properties of the constituent materials and develop quantitative property-function relations that link thermal and mechanical characteristics of the NF-SMA and polymer to predict relative diffusion properties and thus morphological stability.}, number={4}, journal={NATURE MATERIALS}, author={Ghasemi, Masoud and Balar, Nrup and Peng, Zhengxing and Hu, Huawei and Qin, Yunpeng and Kim, Taesoo and Rech, Jeromy J. and Bidwell, Matthew and Mask, Walker and McCulloch, Iain and et al.}, year={2021}, month={Apr}, pages={525-+} }
 @article{zhang_bai_angunawela_xu_luo_li_chai_yu_chen_hu_et al._2021, title={Alkyl-Chain Branching of Non-Fullerene Acceptors Flanking Conjugated Side Groups toward Highly Efficient Organic Solar Cells}, volume={10}, ISSN={["1614-6840"]}, DOI={10.1002/aenm.202102596}, abstractNote={Abstract}, journal={ADVANCED ENERGY MATERIALS}, author={Zhang, Jianquan and Bai, Fujin and Angunawela, Indunil and Xu, Xiaoyun and Luo, Siwei and Li, Chao and Chai, Gaoda and Yu, Han and Chen, Yuzhong and Hu, Huawei and et al.}, year={2021}, month={Oct} }
 @article{hu_ghasemi_peng_zhang_rech_you_yan_ade_2020, title={The Role of Demixing and Crystallization Kinetics on the Stability of Non-Fullerene Organic Solar Cells}, volume={32}, ISSN={["1521-4095"]}, url={https://doi.org/10.1002/adma.202005348}, DOI={10.1002/adma.202005348}, abstractNote={Abstract}, number={49}, journal={ADVANCED MATERIALS}, publisher={Wiley}, author={Hu, Huawei and Ghasemi, Masoud and Peng, Zhengxing and Zhang, Jianquan and Rech, Jeromy James and You, Wei and Yan, He and Ade, Harald}, year={2020}, month={Dec} }
 @article{wu_zhong_hu_li_zhang_li_zhang_ade_jiang_liao_2019, title={A decacyclic indacenodithiophene-based non-fullerene electron acceptor with meta-alkyl-phenyl substitutions for polymer solar cells}, volume={7}, ISSN={["2050-7496"]}, DOI={10.1039/c8ta11972d}, abstractNote={
						Meta-alkyl-phenyl substitutions and fluorination approach selectively optimizes a decacyclic indacenodithiophene-based fused electron acceptor (p-IDTIDT-IC), improving PCE from 6.48% to 11.32%.}, number={8}, journal={JOURNAL OF MATERIALS CHEMISTRY A}, author={Wu, Fupeng and Zhong, Lian and Hu, Huawei and Li, Yun and Zhang, Zhanjun and Li, Yongxi and Zhang, Zhi-Guo and Ade, Harald and Jiang, Zuo-Quan and Liao, Liang-Sheng}, year={2019}, month={Feb}, pages={4063–4071} }
 @article{zhang_li_hu_zhang_ade_yan_2019, title={Chlorinated Thiophene End Groups for Highly Crystalline Alkylated Non-Fullerene Acceptors toward Efficient Organic Solar Cells}, volume={31}, ISSN={["1520-5002"]}, DOI={10.1021/acs.chemmater.9b00980}, abstractNote={End group engineering is critical for developing A-D-A-type non-fullerene acceptors with suitable absorption properties and high crystallinity for organic solar cells. Here, we report the synthesis of a novel chlorinated thiophene end group and its application in A-D-A-type acceptors. When combined with a tetraoctyl-substituted indacenodithieno[3,2-b]thiophene core, the resulting C8-ITCC-Cl acceptor exhibited red-shifted absorption and downshifted energy levels relative to those of the nonchlorinated analogue, C8-ITCC, due to the strong electron-withdrawing ability of the chlorine atoms as revealed by theoretical calculations. Moreover, the noncovalent interactions induced by the chlorine atoms enabled improved lamellar and π–π stacking of C8-ITCC-Cl, leading to a higher electron mobility of 6.6 × 10–4 cm2 V–1 s–1 and a fill factor of 73% of the PBDB-TF:C8-ITCC-Cl devices. Consequently, a high power conversion efficiency of 12.7% was achieved by the C8-ITCC-Cl-based devices, which outperformed the C8-ITCC...}, number={17}, journal={CHEMISTRY OF MATERIALS}, author={Zhang, Jianquan and Li, Yunke and Hu, Huawei and Zhang, Guangye and Ade, Harald and Yan, He}, year={2019}, month={Sep}, pages={6672–6676} }
 @article{ghasemi_hu_peng_rech_angunawela_carpenter_stuard_wadsworth_mcculloch_you_et al._2019, title={Delineation of Thermodynamic and Kinetic Factors that Control Stability in Non-fullerene Organic Solar Cells}, volume={3}, ISSN={["2542-4351"]}, DOI={10.1016/j.joule.2019.03.020}, abstractNote={Although non-fullerene small molecular acceptors (NF-SMAs) are dominating current research in organic solar cells (OSCs), measurements of thermodynamics drivers and kinetic factors determining their morphological stability are lacking. Here, we delineate and measure such factors in crystallizable NF-SMA blends and discuss four model systems with respect to their meta-stability and degree of vitrification. We determine for the first time the amorphous-amorphous phase diagram in an NF-SMA system and show that its deep quench depth can result in severe burn-in degradation. We estimate the relative phase behavior of four other materials systems. Additionally, we derive room-temperature diffusion coefficients and conclude that the morphology needs to be stabilized by vitrification corresponding to diffusion constants below 10−22 cm2/s. Our results show that to achieve stability via rational molecular design, the thermodynamics, glass transition temperature, diffusion properties, and related structure-function relations need to be more extensively studied and understood.}, number={5}, journal={JOULE}, author={Ghasemi, Masoud and Hu, Huawei and Peng, Zhengxing and Rech, Jeromy James and Angunawela, Indunil and Carpenter, Joshua H. and Stuard, Samuel J. and Wadsworth, Andrew and McCulloch, Iain and You, Wei and et al.}, year={2019}, month={May}, pages={1328–1348} }
 @article{yao_bai_hu_arunagiri_zhang_chen_yu_chen_liu_lai_et al._2019, title={Efficient All-Polymer Solar Cells based on a New Polymer Acceptor Achieving 10.3% Power Conversion Efficiency}, volume={4}, ISSN={["2380-8195"]}, DOI={10.1021/acsenergylett.8b02114}, abstractNote={Here we demonstrate efficient all-polymer solar cells (all-PSCs) based on a polymer acceptor named PFBDT-IDTIC. By combining PFBDT-IDTIC with a fluorinated donor polymer (PM6), a high power conversion efficiency of 10.3% can be achieved, which is the highest value reported to date for single-junction all-PSCs. This performance can be attributed to its good absorption property (absorption coefficient: 2.74 × 105 cm–1) and high electron mobility of PFBDT-IDTIC. It is also found that the choice of donor polymer has major impacts on the performance of the cell. By replacing PBDB-T with its fluorinated counterpart, PM6, the VOC, JSC, and FF of the devices were all improved, which can be attributed to the deeper HOMO level of PM6 and more crystalline and pure domains of the active layer blends. Our study provides a promising polymer acceptor for all-PSCs and also shows that selecting a matching donor polymer is important in achieving the optimal all-PSC performance.}, number={2}, journal={ACS ENERGY LETTERS}, author={Yao, Huatong and Bai, Fujin and Hu, Huawei and Arunagiri, Lingeswaran and Zhang, Jianquan and Chen, Yuzhong and Yu, Han and Chen, Shangshang and Liu, Tao and Lai, Joshua Yuk Lin and et al.}, year={2019}, month={Feb}, pages={417–422} }
 @article{hu_ye_ghasemi_balar_rech_stuard_you_brendan t. o'connor_ade_2019, title={Highly Efficient, Stable, and Ductile Ternary Nonfullerene Organic Solar Cells from a Two-Donor Polymer Blend}, volume={31}, ISSN={["1521-4095"]}, url={https://publons.com/wos-op/publon/18518240/}, DOI={10.1002/adma.201808279}, abstractNote={Abstract}, number={17}, journal={ADVANCED MATERIALS}, publisher={Wiley}, author={Hu, Huawei and Ye, Long and Ghasemi, Masoud and Balar, Nrup and Rech, Jeromy James and Stuard, Samuel J. and You, Wei and Brendan T. O'Connor and Ade, Harald}, year={2019}, month={Apr} }
 @article{zhang_bai_li_hu_liu_zou_yu_huang_pan_ade_et al._2019, title={Intramolecular pi-stacked perylene-diimide acceptors for non-fullerene organic solar cells}, volume={7}, ISSN={["2050-7496"]}, DOI={10.1039/c9ta00343f}, abstractNote={Two isomeric perylene diimide acceptors with both intra- and intermolecular π–π stacking are developed for non-fullerene organic solar cells.}, number={14}, journal={JOURNAL OF MATERIALS CHEMISTRY A}, author={Zhang, Jianquan and Bai, Fujin and Li, Yunke and Hu, Huawei and Liu, Bin and Zou, Xinhui and Yu, Han and Huang, Jiachen and Pan, Ding and Ade, Harald and et al.}, year={2019}, month={Apr}, pages={8136–8143} }
 @article{rosenthal_hughes_luginbuhl_ran_karki_ko_hu_wang_ade_nguyen_2019, title={Quantifying and Understanding Voltage Losses Due to Nonradiative Recombination in Bulk Heterojunction Organic Solar Cells with Low Energetic Offsets}, volume={9}, ISSN={["1614-6840"]}, url={https://doi.org/10.1002/aenm.201901077}, DOI={10.1002/aenm.201901077}, abstractNote={Abstract}, number={27}, journal={ADVANCED ENERGY MATERIALS}, publisher={Wiley}, author={Rosenthal, Katie D. and Hughes, Michael P. and Luginbuhl, Benjamin R. and Ran, Niva A. and Karki, Akchheta and Ko, Seo-Jin and Hu, Huawei and Wang, Ming and Ade, Harald and Nguyen, Thuc-Quyen}, year={2019}, month={Jul} }
 @article{arunagiri_zhang_hu_yao_zhang_li_chow_ade_yan_2019, title={Temperature-Dependent Aggregation Donor Polymers Enable Highly Efficient Sequentially Processed Organic Photovoltaics Without the Need of Orthogonal Solvents}, volume={29}, ISSN={["1616-3028"]}, DOI={10.1002/adfm.201902478}, abstractNote={Abstract}, number={33}, journal={ADVANCED FUNCTIONAL MATERIALS}, author={Arunagiri, Lingeswaran and Zhang, Guangye and Hu, Huawei and Yao, Huatong and Zhang, Kai and Li, Yunke and Chow, Philip C. Y. and Ade, Harald and Yan, He}, year={2019}, month={Aug} }
 @article{liu_ma_sheong_zhang_hu_zhang_zhang_li_ma_han_et al._2018, title={Carboxylate substitution position influencing polymer properties and enabling non-fullerene organic solar cells with high open circuit voltage and low voltage loss}, volume={6}, ISSN={["2050-7496"]}, DOI={10.1039/c8ta04935a}, abstractNote={A novel polymer P3TAE enables a high VOC of 1.20 V and a PCE of 8.10% for non-fullerene OSCs.}, number={35}, journal={JOURNAL OF MATERIALS CHEMISTRY A}, author={Liu, Jing and Ma, Lik-Kuen and Sheong, Fu Kit and Zhang, Lin and Hu, Huawei and Zhang, Jing-Xuan and Zhang, Jianquan and Li, Zhengke and Ma, Chao and Han, Xu and et al.}, year={2018}, month={Sep}, pages={16874–16881} }
 @article{liu_ma_li_hu_sheong_zhang_ade_yan_2018, title={Donor polymer based on alkylthiophene side chains for efficient non- fullerene organic solar cells: insights into fluorination and side chain effects on polymer aggregation and blend morphology}, volume={6}, ISSN={["2050-7496"]}, DOI={10.1039/c8ta08769e}, abstractNote={The synergistic effects of overfluorination and alkylthiophene side chain strategies led to 10.60% efficiency for non-fullerene organic solar cells.}, number={46}, journal={JOURNAL OF MATERIALS CHEMISTRY A}, author={Liu, Jing and Ma, Lik-Kuen and Li, Zhengke and Hu, Huawei and Sheong, Fu Kit and Zhang, Guangye and Ade, Harald and Yan, He}, year={2018}, month={Dec}, pages={23270–23277} }
 @article{hu_li_zhang_peng_ma_xin_huang_ma_jiang_zhang_et al._2018, title={Effect of Ring-Fusion on Miscibility and Domain Purity: Key Factors Determining the Performance of PDI-Based Nonfullerene Organic Solar Cells}, volume={8}, ISSN={["1614-6840"]}, DOI={10.1002/aenm.201800234}, abstractNote={Abstract}, number={26}, journal={ADVANCED ENERGY MATERIALS}, author={Hu, Huawei and Li, Yunke and Zhang, Jianquan and Peng, Zhengxing and Ma, Lik-kuen and Xin, Jingming and Huang, Jiachen and Ma, Tingxuan and Jiang, Kui and Zhang, Guangye and et al.}, year={2018}, month={Sep} }
 @article{hu_jiang_chow_ye_zhang_li_carpenter_ade_yan_2018, title={Influence of Donor Polymer on the Molecular Ordering of Small Molecular Acceptors in Nonfullerene Polymer Solar Cells}, volume={8}, ISSN={["1614-6840"]}, url={https://publons.com/wos-op/publon/7528287/}, DOI={10.1002/aenm.201701674}, abstractNote={Abstract}, number={5}, journal={ADVANCED ENERGY MATERIALS}, author={Hu, Huawei and Jiang, Kui and Chow, Philip C. Y. and Ye, Long and Zhang, Guangye and Li, Zhengke and Carpenter, Joshua H. and Ade, Harald and Yan, He}, year={2018}, month={Feb} }
 @article{chen_liu_hu_ma_lai_zhang_ade_yan_2018, title={Modulation of End Groups for Low-Bandgap Nonfullerene Acceptors Enabling High-Performance Organic Solar Cells}, volume={8}, ISSN={["1614-6840"]}, DOI={10.1002/aenm.201801203}, abstractNote={Abstract}, number={27}, journal={ADVANCED ENERGY MATERIALS}, author={Chen, Yuzhong and Liu, Tao and Hu, Huawei and Ma, Tingxuan and Lai, Joshua Yuk Lin and Zhang, Jianquan and Ade, Harald and Yan, He}, year={2018}, month={Sep} }