“…[ 3,[5][6][7][8][9][10][11] In order to make electronic devices applicable in unconventional environments at biotic/abiotic interfaces where conformal and intimate integration with biological systems is required, electronic devices with high mechanical fl exibility are demanded to conquer the mismatch between rigid silicon wafers with soft and curved biological surfaces. [6][7][8][12][13][14][15][16][17] Natural biomaterials have offered lasting inspirations and attractive building blocks for developing next-generation fl exible and biosustainable electronics, such as organic thinfi lm transistors, [18][19][20][21][22] organic displays and light-emitting devices, [ 23,24 ] and organic photovoltaics, [ 25,26 ] thus endowing them with environmental benignity and high performance, together with large-scale fabrication capability at low cost. [27][28][29][30][31][32] At the same time, due to their appealing properties including their biocompatibility, biodegradability, bioresorbability, and natural abundance, as well as their light weight, biomaterials have emerged as excellent candidates for the development of biointegrated electronic devices for biological-related applications, such as sensor skins, [33][34][35] biomedical diagnosis and therapy, [ 36,37 ] and brain-machine interfaces.…”