“Local, but intelligent”: Language Ideologies in the Informant Biographies of the Linguistic Atlas Project

This thesis argues for the relevance of the Linguistic Atlas Project (LAP) for studies of language ideologies, indexicality, and enregisterment. The LAP represents the largest dialect survey of North American English to date, offering an abundance of historical linguistic data for research in dialectology, linguistic geography, and variation over space and time. Additionally, the LAP also contains additional sources of sociolinguistic data, including informant biographies — documents written by fieldworkers at the conclusion of the LAP interview that summarize an informant’s demographic profile, as well as their personality, speech, and caliber as an interviewee. Rife with subjective judgments from the fieldworker, informant biographies present the opportunity for the study of language ideologies in the LAP. This thesis performs a qualitative discourse analysis of 583 informant biographies collected as part of the Linguistic Atlas of the Middle and South Atlantic States (LAMSAS). Focusing on analysis of pragmatic features, this study reveals the ways that language ideologies, indexicality, and enregisterment are encoded into informant biographies and the LAP more broadly. This analysis suggests that linguistic data in the LAP can be understood as products of an indexical, ideological, and enregistered negotiation of language and identity, co-constructed between informants and fieldworkers

Enhanced Out-of-Plane Conductivity and Photovoltaic Performance in <i>n</i> = 1 Layered Perovskites through Organic Cation Design

Layered perovskites with the formula (R–NH₃)₂PbI₄ have excellent environmental stability but poor photovoltaic function due to the preferential orientation of the semiconducting layer parallel to the substrate and the typically insulating nature of the R–NH₃⁺ cation. Here, we report a series of these <i>n</i> = 1 layered perovskites with the form (aromatic-<i>O</i>-linker-NH₃)₂PbI₄ where the aromatic moiety is naphthalene, pyrene, or perylene and the linker is ethyl, propyl, or butyl. These materials achieve enhanced conductivity perpendicular to the inorganic layers due to better energy level matching between the inorganic layers and organic galleries. The enhanced conductivity and visible absorption of these materials led to a champion power conversion efficiency of 1.38%, which is the highest value reported for any <i>n</i> = 1 layered perovskite, and it is an order of magnitude higher efficiency than any other <i>n</i> = 1 layered perovskite oriented with layers parallel to the substrate. These findings demonstrate the importance of leveraging the electronic character of the organic cation to improve optoelectronic properties and thus the photovoltaic performance of these chemically stable low <i>n</i> layered perovskites

Enhanced Out-of-Plane Conductivity and Photovoltaic Performance in <i>n</i> = 1 Layered Perovskites through Organic Cation Design

Layered perovskites with the formula (R–NH₃)₂PbI₄ have excellent environmental stability but poor photovoltaic function due to the preferential orientation of the semiconducting layer parallel to the substrate and the typically insulating nature of the R–NH₃⁺ cation. Here, we report a series of these <i>n</i> = 1 layered perovskites with the form (aromatic-<i>O</i>-linker-NH₃)₂PbI₄ where the aromatic moiety is naphthalene, pyrene, or perylene and the linker is ethyl, propyl, or butyl. These materials achieve enhanced conductivity perpendicular to the inorganic layers due to better energy level matching between the inorganic layers and organic galleries. The enhanced conductivity and visible absorption of these materials led to a champion power conversion efficiency of 1.38%, which is the highest value reported for any <i>n</i> = 1 layered perovskite, and it is an order of magnitude higher efficiency than any other <i>n</i> = 1 layered perovskite oriented with layers parallel to the substrate. These findings demonstrate the importance of leveraging the electronic character of the organic cation to improve optoelectronic properties and thus the photovoltaic performance of these chemically stable low <i>n</i> layered perovskites

Enhanced Out-of-Plane Conductivity and Photovoltaic Performance in <i>n</i> = 1 Layered Perovskites through Organic Cation Design

Layered perovskites with the formula (R–NH₃)₂PbI₄ have excellent environmental stability but poor photovoltaic function due to the preferential orientation of the semiconducting layer parallel to the substrate and the typically insulating nature of the R–NH₃⁺ cation. Here, we report a series of these <i>n</i> = 1 layered perovskites with the form (aromatic-<i>O</i>-linker-NH₃)₂PbI₄ where the aromatic moiety is naphthalene, pyrene, or perylene and the linker is ethyl, propyl, or butyl. These materials achieve enhanced conductivity perpendicular to the inorganic layers due to better energy level matching between the inorganic layers and organic galleries. The enhanced conductivity and visible absorption of these materials led to a champion power conversion efficiency of 1.38%, which is the highest value reported for any <i>n</i> = 1 layered perovskite, and it is an order of magnitude higher efficiency than any other <i>n</i> = 1 layered perovskite oriented with layers parallel to the substrate. These findings demonstrate the importance of leveraging the electronic character of the organic cation to improve optoelectronic properties and thus the photovoltaic performance of these chemically stable low <i>n</i> layered perovskites

Enhanced Out-of-Plane Conductivity and Photovoltaic Performance in <i>n</i> = 1 Layered Perovskites through Organic Cation Design

Layered perovskites with the formula (R–NH₃)₂PbI₄ have excellent environmental stability but poor photovoltaic function due to the preferential orientation of the semiconducting layer parallel to the substrate and the typically insulating nature of the R–NH₃⁺ cation. Here, we report a series of these <i>n</i> = 1 layered perovskites with the form (aromatic-<i>O</i>-linker-NH₃)₂PbI₄ where the aromatic moiety is naphthalene, pyrene, or perylene and the linker is ethyl, propyl, or butyl. These materials achieve enhanced conductivity perpendicular to the inorganic layers due to better energy level matching between the inorganic layers and organic galleries. The enhanced conductivity and visible absorption of these materials led to a champion power conversion efficiency of 1.38%, which is the highest value reported for any <i>n</i> = 1 layered perovskite, and it is an order of magnitude higher efficiency than any other <i>n</i> = 1 layered perovskite oriented with layers parallel to the substrate. These findings demonstrate the importance of leveraging the electronic character of the organic cation to improve optoelectronic properties and thus the photovoltaic performance of these chemically stable low <i>n</i> layered perovskites

Enhanced Out-of-Plane Conductivity and Photovoltaic Performance in <i>n</i> = 1 Layered Perovskites through Organic Cation Design

Layered perovskites with the formula (R–NH₃)₂PbI₄ have excellent environmental stability but poor photovoltaic function due to the preferential orientation of the semiconducting layer parallel to the substrate and the typically insulating nature of the R–NH₃⁺ cation. Here, we report a series of these <i>n</i> = 1 layered perovskites with the form (aromatic-<i>O</i>-linker-NH₃)₂PbI₄ where the aromatic moiety is naphthalene, pyrene, or perylene and the linker is ethyl, propyl, or butyl. These materials achieve enhanced conductivity perpendicular to the inorganic layers due to better energy level matching between the inorganic layers and organic galleries. The enhanced conductivity and visible absorption of these materials led to a champion power conversion efficiency of 1.38%, which is the highest value reported for any <i>n</i> = 1 layered perovskite, and it is an order of magnitude higher efficiency than any other <i>n</i> = 1 layered perovskite oriented with layers parallel to the substrate. These findings demonstrate the importance of leveraging the electronic character of the organic cation to improve optoelectronic properties and thus the photovoltaic performance of these chemically stable low <i>n</i> layered perovskites