{'fraction_non_alphanumeric': 0.03160040774719674, 'fraction_numerical': 0.0163098878695209, 'mean_word_length': 5.964539007092198, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Improved Moisture Stability of 2D Hybrid Perovskite (HOOC–CH2–NH3)2PbI4 by Dehydration Condensation between Organic Components

In this work, a one-step solution-processing approach was purposed and demonstrated for the dehydration condensation between the organic components of 2D hybrid perovskite (HOOC–CH2–NH3)2PbI4 (abbreviated as Gly2PbI4). The novel product obtained after condensation (labeled as Gly2PbI4-DCC) shows greatly enhanced stability without any obvious degradation in the accelerated moisture-tolerance test. XPS reveals the strong covalent bonds formed between the adjacent −COOH and −NH3+ terminal groups. XRD, SEM, TEM, and moisture-tolerance test results show that the change from noncovalent interactions to covalent interactions helps the 2D hybrid perovskite to resist the intrusion of moisture, as well as facilitates the growth of smooth and uniform films. This work sheds light on the moisture stability problem of organic–inorganic hybrid perovskites.