Conjugated polymers need to be doped to increase charge carrier density and reach the electrical conductivity necessary for electronic and energy applications. While doping increases carrier density, Coulomb interactions between the dopant molecules and the localized carriers are poorly screened, causing broadening and a heavy tail in the electronic density‐of‐states (DOS). The authors examine the effects of dopant‐induced disorder on two complimentary charge transport properties of semiconducting polymers, the Seebeck coefficient and electrical conductivity, and demonstrate a way to mitigate them. Their simulations, based on a modified Gaussian disorder model with Miller‐Abrahams hopping rates, show that dopant‐induced broadening of the DOS negatively impacts the Seebeck coefficient versus electrical conductivity trade‐off curve. Increasing the dielectric permittivity of the polymer mitigates dopant‐carrier Coulomb interactions and improves charge transport, evidenced by simultaneous increases in conductivity and the Seebeck coefficient. They verified this increase experimentally in iodine‐doped P3HT and P3HT blended with barium titanate (BaTiO3) nanoparticles. The addition of 2% w/w BaTiO3 nanoparticles increased conductivity and Seebeck across a broad range of doping, resulting in a fourfold increase in power factor. Thus, these results show a promising path forward to reduce the dopant‐charge carrier Coulomb interactions and mitigate their adverse impact on charge transport.

Increasing evidence suggests that climate change impacts are already observed around the world. Global environmental assessments face challenges to appraise the growing literature. Here we use the language model BERT to identify and classify studies on observed climate impacts, producing a comprehensive machine-learning-assisted evidence map. We estimate that 102,160 (64,958–164,274) publications document a broad range of observed impacts. By combining our spatially resolved database with grid-cell-level human-attributable changes in temperature and precipitation, we infer that attributable anthropogenic impacts may be occurring across 80% of the world’s land area, where 85% of the population reside. Our results reveal a substantial ‘attribution gap’ as robust levels of evidence for potentially attributable impacts are twice as prevalent in high-income than in low-income countries. While gaps remain on confidently attributabing climate impacts at the regional and sectoral level, this database illustrates the potential current impact of anthropogenic climate change across the globe. Evidence is growing on the impacts of climate change on human and natural systems. A two-step attribution approach—machine-learning-assisted literature review coupled with grid-cell-level temperature and precipitation—allows comprehensive mapping of the evidence on impacts and tentative attribution to anthropogenic influence.

PurposeThe aim of this study is to investigate a mediation role of leadership over business performance and socioemotional wealth, within two Bosnian family businesses. This research purpose brings interesting highlights regarding how family businesses embedded the role of leadership that it might have a tremendous influence on business performance while tuning the socioemotional wealth.Design/methodology/approachThis study is based on qualitative research methodology. The sample is collected based on a purposive sampling method as in most qualitative studies. As the instrument for data collection is concerned, in-person-semi-structured interview has been employed with the owner-manager of each particular-family firm. Thus, two case studies were conducted and analyzed.FindingsThe research contributes both to the theory and the practice. From the theoretical perspective, it contributes to the theoretical knowledge of leadership as an important role in relationship between the socioemotional wealth and business performance. The practical contribution of this research could be summed up in the sense that business owners should seek to employ positive leadership vibes to create a good socioemotional wealth so that would be positively reflected in overall business performance of a family business. Other findings are further discussed.Originality/valueScarce empirical research offers mixed results while theoretical propositions that organizational governance (leadership) plays an important role in this relationship, is somehow neglected. Hence, this is the first empirical study on this particular that investigates this topic in Bosnia and Herzegovina (BiH), even in the Balkan region.